K-Tec

Spectroscopic Observation of BE Star - 4 Hercules

  • DaveGrennan
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13 years 11 months ago #89158 by DaveGrennan
4 Hercules is a mag 5.75 star which is a known BE star with an edge on circumstellar disk. I made a spectroscopic observation of this star last night 20/21 April. I have written up a little report including the method used to calculate the rotational velocity of the circumstellar disk.

www.webtreatz.com/index.php/articles/34-...f-be-star-4-hercules

Dave.

Regards and Clear Skies,

Dave.
J41 - Raheny Observatory.
www.webtreatz.com
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13 years 11 months ago - 13 years 11 months ago #89159 by johnomahony
Nice work Dave. Its not so long ago that the first pioneers were making discoveries like this for the first time. It must feel pretty good.
I'm amazed the H alpha line is split so much, I always imagined the shift was small. Intuitively, I would expect a central peak from the main star and a shoulder on each side due to the surrounding disk. Interesting stuff......
A magnetic field can also split emission lines(Zeeman effect?). I wonder if there are any objects in the sky that show magnetic effects?

The Lord giveth, the Revenue taketh away. (John 1:16)

www.flickr.com/photos/7703127@N07/
Last edit: 13 years 11 months ago by johnomahony.

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  • DaveGrennan
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13 years 11 months ago #89160 by DaveGrennan
John one of the places the zeeman effect is most pronounced is in sunspots. Depending on the strength of the local magnetic field it is possible to see this as a broadening or even splitting of some of the lines. In order to do this I will have to wait until I have an appropriate solar filter for the C14.

Regards and Clear Skies,

Dave.
J41 - Raheny Observatory.
www.webtreatz.com
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  • DaveGrennan
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13 years 11 months ago #89161 by DaveGrennan

johnomahony wrote: Intuitively, I would expect a central peak from the main star and a shoulder on each side due to the surrounding disk.


John, I missed this bit in your reply. Normally you would expect to see an absorption rather than an emission in the H-Alpha region from the main star itself. However in BE stars like this the absorption line is overwhelmed by the emission lines from the circumstellar disk.

Regards and Clear Skies,

Dave.
J41 - Raheny Observatory.
www.webtreatz.com
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13 years 11 months ago #89168 by mjc
Dave - good to see some results.

Question though: if the accretion disc is not edge on to the observer wont this tend to skew the results such that rotation appears slower than it really is? Therefore what we measure here is a lower-bound on what the actual rotation speed is?

Mark C

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  • DaveGrennan
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13 years 11 months ago #89173 by DaveGrennan
Mark, your right. However the orientation of the accretion disk has a huge impact on the HA profile. For example if the disk was face on the we would see a central peak in emission with no shifting at all. Also some accretion disks rotate so fast that material is being ejected in every direction this creates a very broad emission line.

In short if the disk was say at 45degrees, the central 'trough' would only extend half way to the base, as it becomes more and more face on the central depression in the profile disappears. In this case we can see the center of the profile extending all the way to the base and the classic 'wings' (slight but broad absorptions flanking either side) which all put together clearly describes a classic edge on profile.

I hope to gather some more examples of BE stars once the skies permit.

Dave.

Regards and Clear Skies,

Dave.
J41 - Raheny Observatory.
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  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '2'121μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '40'110μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '30'271μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '45'118μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '46'117μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '528'109μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SHOW FULL COLUMNS FROM `tifas_kunena_topics`334μs1.7KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT * FROM `tifas_kunena_topics` WHERE `id` = '89158'152μs13.81KB/libraries/kunena/src/Tables/TableKunenaTopics.php:223Copy
  • SHOW FULL COLUMNS FROM `tifas_kunena_messages`316μs1.58KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT m.*,t.message FROM `tifas_kunena_messages` AS `m` INNER JOIN `tifas_kunena_messages_text` AS `t` ON `m`.`id` = `t`.`mesid` WHERE `m`.`id` = 89158687μs2.53KB/libraries/kunena/src/Tables/TableKunenaMessages.php:216Copy
  • SELECT COUNT(*) FROM `tifas_kunena_messages` AS `a` WHERE `thread` = '89158' AND `a`.`hold` IN (0)204μs536B/libraries/kunena/src/Database/Object/KunenaFinder.php:278Copy
  • SELECT a.id FROM `tifas_kunena_messages` AS `a` WHERE `thread` = '89158' AND `a`.`hold` IN (0) ORDER BY a.`time` ASC LIMIT 6171μs616B/libraries/kunena/src/Database/Object/KunenaFinder.php:234Copy
  • SELECT m.*, t.message FROM `tifas_kunena_messages` AS `m` INNER JOIN `tifas_kunena_messages_text` AS `t` ON m.id = t.mesid WHERE `m`.`id` IN (89159,89160,89161,89168,89173)622μs2.59KB/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:120Copy
  • SELECT * FROM `tifas_kunena_thankyou` WHERE `postid` IN (89158,89159,89160,89161,89168,89173)119μs688B/libraries/kunena/src/Forum/Message/Thankyou/KunenaMessageThankyouHelper.php:116Copy
  • SELECT u.name, u.username, u.email, u.block AS blocked, u.registerDate, u.lastvisitDate, ku.*, u.id AS userid FROM `tifas_users` AS `u` LEFT JOIN `tifas_kunena_users` AS `ku` ON `u`.`id` = `ku`.`userid` WHERE `u`.`id` IN (386,913,1582)275μs25.03KB/libraries/kunena/src/User/KunenaUserHelper.php:247Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (89158,89159,89160,89161,89168,89173)96μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_user_topics` WHERE (`user_id` = '0') AND (`topic_id` IN (89158))91μs1.27KB/libraries/kunena/src/Forum/Topic/User/KunenaTopicUserHelper.php:159Copy
  • SHOW FULL COLUMNS FROM `tifas_kunena_user_topics`332μs1.42KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT `code`,`location` FROM `tifas_kunena_smileys`83μs960B/libraries/kunena/src/BBCode/KunenaBBCode.php:1122Copy
  • UPDATE `tifas_kunena_topics` SET `hits` = (`hits` + 1) WHERE `id` = '89158'438μs48B/libraries/src/Table/Table.php:1325Copy
  • SELECT `m`.`id`,`m`.`title`,`m`.`module`,`m`.`position`,`m`.`content`,`m`.`showtitle`,`m`.`params`,`mm`.`menuid` FROM `tifas_modules` AS `m` LEFT JOIN `tifas_modules_menu` AS `mm` ON `mm`.`moduleid` = `m`.`id` LEFT JOIN `tifas_extensions` AS `e` ON `e`.`element` = `m`.`module` AND `e`.`client_id` = `m`.`client_id` WHERE ( ( (`m`.`published` = 1 AND `e`.`enabled` = 1 AND `m`.`client_id` = :clientId AND `m`.`access` IN (:preparedArray1)) AND (`m`.`publish_up` IS NULL OR `m`.`publish_up` <= :publishUp)) AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= :publishDown)) AND (`mm`.`menuid` = :itemId OR `mm`.`menuid` <= 0) ORDER BY `m`.`position`,`m`.`ordering`866μs1.86KBParams/libraries/src/Cache/Controller/CallbackController.php:51Copy
  • SHOW FULL COLUMNS FROM `tifas_kunena_polls`299μs1.33KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT * FROM `tifas_kunena_ranks`100μs1.48KB/libraries/kunena/src/User/KunenaUser.php:1629Copy
  • SELECT userid, MAX(time) AS time FROM `tifas_session` WHERE `client_id` = 0 AND `userid` > 0 AND `time` > '1744218322' GROUP BY `userid` ORDER BY `time` DESC167μs576B/libraries/kunena/src/User/KunenaUserHelper.php:544Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (89158)109μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (89158)85μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (89159)286μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (89159)79μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT m.id, mm.hold, m.catid AS category_id, m.thread AS topic_id, SUM(mm.time<m.time) AS before_count, SUM(mm.time>m.time) AS after_count FROM `tifas_kunena_messages` AS `m` INNER JOIN `tifas_kunena_messages` AS `mm` ON `m`.`thread` = `mm`.`thread` WHERE `m`.`id` IN (89159) GROUP BY `m`.`id`,`mm`.`hold`229μs832B/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:539Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (89160)101μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (89160)80μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT m.id, mm.hold, m.catid AS category_id, m.thread AS topic_id, SUM(mm.time<m.time) AS before_count, SUM(mm.time>m.time) AS after_count FROM `tifas_kunena_messages` AS `m` INNER JOIN `tifas_kunena_messages` AS `mm` ON `m`.`thread` = `mm`.`thread` WHERE `m`.`id` IN (89160) GROUP BY `m`.`id`,`mm`.`hold`201μs832B/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:539Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (89161)92μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (89161)80μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT m.id, mm.hold, m.catid AS category_id, m.thread AS topic_id, SUM(mm.time<m.time) AS before_count, SUM(mm.time>m.time) AS after_count FROM `tifas_kunena_messages` AS `m` INNER JOIN `tifas_kunena_messages` AS `mm` ON `m`.`thread` = `mm`.`thread` WHERE `m`.`id` IN (89161) GROUP BY `m`.`id`,`mm`.`hold`184μs832B/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:539Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (89168)128μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (89168)93μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT m.id, mm.hold, m.catid AS category_id, m.thread AS topic_id, SUM(mm.time<m.time) AS before_count, SUM(mm.time>m.time) AS after_count FROM `tifas_kunena_messages` AS `m` INNER JOIN `tifas_kunena_messages` AS `mm` ON `m`.`thread` = `mm`.`thread` WHERE `m`.`id` IN (89168) GROUP BY `m`.`id`,`mm`.`hold`189μs832B/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:539Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (89173)114μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (89173)79μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM tifas_fields AS a LEFT JOIN `tifas_languages` AS l ON l.lang_code = a.language LEFT JOIN tifas_users AS uc ON uc.id=a.checked_out LEFT JOIN tifas_viewlevels AS ag ON ag.id = a.access LEFT JOIN tifas_users AS ua ON ua.id = a.created_user_id LEFT JOIN tifas_fields_groups AS g ON g.id = a.group_id WHERE ( (`a`.`context` = :context AND `a`.`access` IN (:preparedArray1)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray2)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform ORDER BY a.ordering ASC617μs4.03KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT * FROM `tifas_kunena_announcement` WHERE `published` = 1 AND (`publish_up` = '1000-01-01 00:00:00' OR `publish_up` <= '2025-04-09 17:35:22') AND (`publish_down` ='1000-01-01 00:00:00' OR `publish_down` >= '2025-04-09 17:35:22') ORDER BY `id` DESC LIMIT 1112μs1.42KB/libraries/kunena/src/Forum/Announcement/KunenaAnnouncementHelper.php:145Copy
  • SHOW FULL COLUMNS FROM `tifas_jev_users`358μs1.58KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `tifas_categories` AS `c` WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1) AND `c`.`published` = 1 ORDER BY `c`.`lft`275μs3.91KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT c.id FROM tifas_categories AS c WHERE c.access IN (1) AND c.published = 1 AND c.language in ('en-GB','*') AND c.extension = 'com_jevents' ORDER BY c.lft asc196μs584B/components/com_jevents/libraries/dbmodel.php:547Copy
  • SELECT c.id FROM tifas_categories AS c WHERE c.access IN (1) AND c.published = 1 AND c.language in ('en-GB','*') AND c.extension = 'com_jevents' AND ((c.lft>=87 AND c.rgt<=88 )) ORDER BY c.lft asc164μs536B/components/com_jevents/libraries/dbmodel.php:547Copy
  • SELECT ev.ev_id FROM tifas_jevents_repetition as rpt INNER JOIN tifas_jevents_vevent as ev ON rpt.eventid = ev.ev_id INNER JOIN tifas_jevents_icsfile as icsf ON icsf.ics_id=ev.icsid INNER JOIN tifas_jevents_vevdetail as det ON det.evdet_id = rpt.eventdetail_id LEFT JOIN tifas_jevents_rrule as rr ON rr.eventid = rpt.eventid WHERE ev.catid IN(-1,68) AND ev.created >= '2024-10-11 00:00:00' AND ev.created <= '2025-10-06 23:59:59' AND ev.state=1 AND ev.access IN (1) AND icsf.state=1 AND icsf.access IN (1) GROUP BY ev.ev_id ORDER BY ev.created DESC LIMIT 10780μs520B/components/com_jevents/libraries/dbmodel.php:271Copy
  • SELECT rpt.*, ev.*, rr.*, det.*, ev.state as published, ev.created as created , YEAR(rpt.startrepeat) as yup, MONTH(rpt.startrepeat ) as mup, DAYOFMONTH(rpt.startrepeat ) as dup , YEAR(rpt.endrepeat ) as ydn, MONTH(rpt.endrepeat ) as mdn, DAYOFMONTH(rpt.endrepeat ) as ddn , HOUR(rpt.startrepeat) as hup, MINUTE(rpt.startrepeat ) as minup, SECOND(rpt.startrepeat ) as sup , HOUR(rpt.endrepeat ) as hdn, MINUTE(rpt.endrepeat ) as mindn, SECOND(rpt.endrepeat ) as sdn FROM tifas_jevents_repetition as rpt INNER JOIN tifas_jevents_vevent as ev ON rpt.eventid = ev.ev_id INNER JOIN tifas_jevents_icsfile as icsf ON icsf.ics_id=ev.icsid INNER JOIN tifas_jevents_vevdetail as det ON det.evdet_id = rpt.eventdetail_id LEFT JOIN tifas_jevents_rrule as rr ON rr.eventid = rpt.eventid WHERE ev.catid IN(-1,68) AND ev.created >= '2024-10-11 00:00:00' AND ev.created <= '2025-10-06 23:59:59' AND ev.state=1 AND ev.access IN (1) AND icsf.state=1 AND icsf.access IN (1) AND ev.ev_id IN (0) ORDER BY ev.created DESC , rpt.startrepeat ASC303μs10.33KB/components/com_jevents/libraries/dbmodel.php:3274Copy
  • SELECT `name`,`element` FROM `tifas_extensions` WHERE `type` = 'plugin' AND `folder` = 'finder' AND `enabled` = 1261μs736B/administrator/components/com_finder/src/Helper/LanguageHelper.php:134Copy
  • SELECT `title` FROM `tifas_finder_taxonomy` WHERE `parent_id` = 1 AND `state` = 1 AND `access` IN (1)119μs584B/administrator/components/com_finder/src/Indexer/Taxonomy.php:314Copy
  • SELECT * FROM `tifas_banners` WHERE (`reset` <= :date AND `reset` IS NOT NULL) AND (`checked_out` IS NULL OR `checked_out` = :userId)191μs5.39KBParams/administrator/components/com_banners/src/Helper/BannersHelper.php:69Copy
  • SELECT `a`.`id`,`a`.`type`,`a`.`name`,`a`.`clickurl`,`a`.`sticky`,`a`.`cid`,`a`.`description`,`a`.`params`,`a`.`custombannercode`,`a`.`track_impressions`,`cl`.`track_impressions` AS `client_track_impressions` FROM `tifas_banners` AS `a` LEFT JOIN `tifas_banner_clients` AS `cl` ON `cl`.`id` = `a`.`cid` WHERE ( ( (`a`.`state` = 1) AND (`a`.`publish_up` IS NULL OR `a`.`publish_up` <= :nowDate1)) AND (`a`.`publish_down` IS NULL OR `a`.`publish_down` >= :nowDate2)) AND (`a`.`imptotal` = 0 OR `a`.`impmade` < `a`.`imptotal`) AND `a`.`catid` IN (:preparedArray1) ORDER BY `a`.`sticky` DESC, RAND() LIMIT 1418μs2.28KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • UPDATE `tifas_banners` SET `impmade` = `impmade` + 1 WHERE `id` IN (:preparedArray1)409μs856BParams/components/com_banners/src/Model/BannersModel.php:315Copy
  • UPDATE `tifas_banner_tracks` SET `count` = `count` + 1 WHERE `track_type` = 1 AND `banner_id` = :id AND `track_date` = :trackDate496μs832BParams/components/com_banners/src/Model/BannersModel.php:352Copy
  • SELECT `a`.`id`,`a`.`asset_id`,`a`.`title`,`a`.`type`,`a`.`execution_rules`,`a`.`state`,`a`.`last_exit_code`,`a`.`locked`,`a`.`last_execution`,`a`.`next_execution`,`a`.`times_executed`,`a`.`times_failed`,`a`.`priority`,`a`.`ordering`,`a`.`note`,`a`.`checked_out`,`a`.`checked_out_time`,`uc`.`name` AS `editor` FROM `tifas_scheduler_tasks` AS `a` LEFT JOIN `tifas_users` AS `uc` ON `uc`.`id` = `a`.`checked_out` WHERE `a`.`state` = :state AND `a`.`next_execution` <= :now ORDER BY `a`.`title` asc188μs3.16KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:391Copy
  • SELECT `a`.`id`,`a`.`asset_id`,`a`.`title`,`a`.`type`,`a`.`execution_rules`,`a`.`state`,`a`.`last_exit_code`,`a`.`locked`,`a`.`last_execution`,`a`.`next_execution`,`a`.`times_executed`,`a`.`times_failed`,`a`.`priority`,`a`.`ordering`,`a`.`note`,`a`.`checked_out`,`a`.`checked_out_time`,`uc`.`name` AS `editor` FROM `tifas_scheduler_tasks` AS `a` LEFT JOIN `tifas_users` AS `uc` ON `uc`.`id` = `a`.`checked_out` WHERE `a`.`state` = :state AND `a`.`locked` IS NOT NULL ORDER BY `a`.`title` asc150μs3.18KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:391Copy
  • SHOW TABLES701μs8.51KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:678Copy