2015年雙子獅子變星

[曹大貓咪]

今年冬天觀測到2月底.3月北部幾乎都是天氣有雲或下雨.到月底才有較好天氣觀測.於是趁大晴天將天文台內儀器曬日頭並打掃及調整儀器.

晚上有薄霧但,最大問題是月亮過近雙子座.所以雖不利雙子座變星觀測但還是趁好天氣做一完整觀測.特別是U GEM這顆變星(白矮新星類).另外就是進行初夏的獅子座變星群觀測.
*.當晚總共觀測15顆變星.但因其中四顆亮度已降到14等以下,不予分析數據.

2015年3月28日 晚上7h38m -9h20m

溫度:18度c   濕度 68%   透明度:2/5-1/5   視狀 3/5    上弦月


Observations submitted since last login:
------------------------------------------------------------------------
       Name     JD                         CalendarDate          Mag(v)
------------------------------------------------------------------------
 1   Z LEO   2457110.03125     2015 Mar 28.5313       8.4  V    
 2   V LEO   2457110.02431     2015 Mar 28.5243     13.5  V  
 3   S LEO   2457110.01458     2015 Mar 28.5146     12.9  V    
 4   R LEO   2457110.01319     2015 Mar 28.5132       9.0  V  
 5   X GEM  2457110.00417     2015 Mar 28.5042     12.1  V
 6  W GEM  2457110.00278     2015 Mar 28.5028       7.3  V  
 7   V GEM  2457109.99583     2015 Mar 28.4958     13.2  V    
 8   U GEM  2457109.99514     2015 Mar 28.4951     13.9  V    
 9   T GEM  2457109.99444     2015 Mar 28.4944       9.2  V  
 10 S GEM  2457109.98750     2015 Mar 28.4875     12.0  V  
 11 R GEM  2457109.98542     2015 Mar 28.4854       8.0  V
-----------------------------------------------------------------------
大溪天文台  10"SCT F/6.3 +ST2000XM CCD  冷卻-5度C  曝光60秒
AAVSO Observatory Code : TYGA TW (大溪天文台 台灣)
------------------------------------------------------------------------

大溪及世界各地業餘觀測者的觀測資料及曲線可參考  http://www.aavso.org/data/lcg

fig 1: 雙子座 U 變星200天的曲線 (周期性白矮新星的代表變星之一    美國AAVSO 提供)
fig 2: 28日當晚的雙子座 U 變星  (大溪天文台提供 )

老貓豆知識:
這顆變星位於雙子座.它本身是一顆白矮星造成新星爆發的代表之一! 換句話說本身就是雙星系統(主角是小小白矮星,配角是大大紅巨星..不過主角看不到,只能看到這顆M型紅矮星).這顆變星於1855年所發現到現在觀測中,發現約100-250天會爆發一次新星現象(由穩定約14等突然直線上昇到9等亮星,然後再較慢的速率變暗回到原亮度.) 爆發原因和去年的海豚座新星相似.

[cuteip]

請問大貓

我用AAVSO查了一下這一顆U Gem
http://www.aavso.org/vsx/index.php?view=detail.top&oid=14298

怎麼查到
Period   0.1769061

好像跟約100-250天會爆發一次新星現象 衝突

還是這代表另一種意思??

[曹大貓咪]

是的。這顆雙子座U變星是顆近密雙星系統。周期為4小時11分。（period 0.176）.但爆發周期則為約100天左右。測定如此短周期可利用differential photometry 觀測看看……

[曹大貓咪]

2015年兒童節 大溪 月全食

這次基本上大溪的天氣從晚上開始,地面開始有雲霧慢慢覆蓋了天空,月亮剛開始從雲霧中搶拍了幾張都不理想...到隨著時間到了8點月全食最佳拍攝時間,則是完全無法觀測或拍照!到了8點半則關閉天文台下樓去看電視了...這次中南部就非常理想,北部則幾乎貢龜!

10"SCT F/6.3+CANON 5D 直焦點  大溪天文台

[cuteip]

是的。這顆雙子座U變星是顆近密雙星系統。周期為4小時11分。（period 0.176）.但爆發周期則為約100天左右。測定如此短周期可利用differential photometry 觀測看看……

所以那個短週期的是食雙星造成的吧!!

我看AAVSO上寫的是UGSS + E

不過週期這麼短 應該很近 不好觀測吧!!

[cuteip]

找到了
原來這一顆還是典範級的呢!!!

http://zh.wikipedia.org/wiki/%E9%9B%99%E5%AD%90%E5%BA%A7U

[曹大貓咪]

對變星有興趣的鄉親和同好們,如果有興趣參加104屆 春季AAVSO變星會議 ,可在以下的時間和AAVSO取得聯繫.可發表觀測心得或問題互動.這是已有數十年的歷史會議.幫助全世界變星觀測家最佳研究報告和觀測心得資訊交流...

104th Spring Meeting of the AAVSO


Dear Young Chiech,

 Our AAVSO meetings are excellent places to interact with your community and get a comprehensive update on new and existing projects. At the same time, we understand that it is not always possible to participate in person. Therefore, this year, for the first time, we are providing the opportunity for you to join our Spring meeting remotely and also to access the recorded oral sessions after the meeting.

 As an online meeting attendee, you will have access to:

Paper Sessions: We are light! Keeping with our meeting theme, papers on any topic dealing with the variable light from the night sky or the sun will be presented.

 First session: Friday, June 6, starting at 1300 UT
 Second session: Saturday, June 7, starting at 1800 UT

Membership Meeting and Awards Presentation: This will be held on Saturday morning (Eastern Daylight Time) with the aim to inform attendees of the activities of the Association. The Treasurer's and Director’s Reports will be included. We will leave plenty of time for Q&A and will be taking questions both in person and online.

 Saturday, June 7, starting at 1300 UT

 We will be using a webinar service to broadcast the meeting.  Video will consist primarily of the presenter's PowerPoint presentation with occasional webcam shots. We will also give online participants access to recordings of each session for a limited time (2-3 months) after the meeting, in case the time of the live presentations is not convenient.

 Thank you for your dedication to the AAVSO. Your continued support is essential for the Association to fulfill our mission. I hope to “see” you online in June!

 Best wishes – clear skies,

  

Copyright © 2015 American Association of Variable Star Observers, All rights reserved.
 We hope you will join us online!

Our mailing address is:

American Association of Variable Star Observers

49 Bay State Rd.
Cambridge, MA 02138
 
 *.老貓已有近百顆脈動長周期變星觀測數據和數篇觀測整理及分析資料提供給AAVSO.盡了一分小小台灣天文同好在世界性觀測合作的義務.也希望有興趣的鄉親和同好加入變星觀測和AAVSO.