AAVSO Alert Notice 526
August 20, 2015
Monitoring of LS IV -14 116 in support of upcoming satellite observations
Prof. Simon Jeffery (Armagh Observatory; Trinity College Dublin) has requested photometric monitoring of the pulsating helium and zirconium-rich hot subdwarf LS IV -14 116 in support of upcoming HST and VLT/UVES spectroscopy. AAVSO observations will supplement photometry due to be obtained with the SAAO 1.0-m and IAC 0.8-m telescopes from 18 August to 2 September 2015. Photometry is requested beginning immediately through 2 September.
LS IV -14 116 is magnitude V=13.0 and B=12.6. Prof. Jeffery writes:
"The star shows at least 5 independent pulsation frequencies. The objective of these observations is to resolve the frequencies, to measure their amplitudes, and also to measure the amplitude of any colour variations, so as to set the high-resolution spectroscopy and ultraviolet spectrophotometry into context.
"Requirements are:
i) at least one of Johnson B and V filters (both if available, cycled BVBVB..., and/or BVRBVR... or BVIBVI...)
ii) 10,000 target counts per frame (for LS IV-14 116, unless bright comparison is saturated and no other good comparisons in field). The
10,000 counts requirement is indicative rather than a minimum, and exposures of up to 100 s are acceptable, so long as the overall cadence provides a data point in each filter every 300 s (5 minutes) or less. The shortest period exhibited by the star is 1950 s, which we would like to sample well.
iii) exposures times 60 seconds or less (per filter)
iv) timestamps on image frames to be precise and regularly checked against GPS or other external clock
v) minimum useful runs: 2 hours; data obtained over long runs and several nights is preferred
vi) useful dates: 19 August to 2 September
"...If AAVSO observers prefer not to exercise their filter wheels all night, then continuous photometry in just the B-band would be acceptable. I am conscious that many filter wheels for the commercial market are not very robust (we have one in Armagh!). We can deduce the colour amplitudes from fewer sites, but refining the window function for the B data would be really good."
For some general background on this fascinating type of star, see:
https://dl.dropboxusercontent.com/u/751 ... 2.32-5.pdf
Coordinates: RA 20 57 38.88 Dec -14 25 44.0 (J2000)
Finder charts with comparison stars for LS IV -14 116 may be created using the AAVSO Variable Star Plotter (VSP, https://www.aavso.org/vsp).
A photometry table is also available via VSP.
For those using CCD chips with a small field of view, Prof. Jeffery requests the comparison stars TYC 5782-1367-1 and 2MASS J20574148-1426122 (labeled 112 and 147, respectively, in the AAVSO sequence). However, observers whose CCD chip has a larger field of view are urged to use comparison stars other than the 147 because that star is very red and the target is blue. Also, observers using the 112 in particular are cautioned to beware of saturating this comp star.
Please report observations to the AAVSO International Database using WebObs and the name "LS IV -14 116". Be careful to include all the spaces in the name as shown.
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
----------------------------------
SUBMIT OBSERVATIONS TO THE AAVSO
Information on submitting observations to the AAVSO may be found at:
http://www.aavso.org/webobs
ALERT NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION
An Alert Notice archive is available at the following URL:
http://www.aavso.org/alert-notice-archive
Subscribing and Unsubscribing may be done at the following URL:
http://www.aavso.org/observation-notifi ... ertnotices
Monitoring of LS IV -14 116 requested
Exoplanet occultation, asteroid occultation,
solar research, comet observation, astrometry, etc.
solar research, comet observation, astrometry, etc.
回覆文章
1 篇文章
• 第 1 頁 (共 1 頁)
回到「業餘天文研究專區 Amateur Astronomers' Research Area」
前往
- 天文 ASTRONOMY
- ↳ FAQ 天文
- ↳ 天文話題 Everything about Astronomy
- ↳ 天文攝影 Astrophotography
- ↳ 太陽觀測和攝影 Solar Observation & Photography
- ↳ 望遠鏡 廠制儀器 測試報告專欄 Telescope Testing Report Center
- ↳ 自製天文望遠鏡 Amateur Telescope Making
- ↳ 自製天文儀器 diy Astro Equipment
- ↳ 天文儀器维修中心
- ↳ 廠製儀器 Factory Equipment
- ↳ Raspberry Pi 自動導星裝置 diy Autoguiding
- ↳ 天文台 Observatory
- ↳ 香港搖控天文台 Hong Kong Remote Telescope
- ↳ 玉衡遙控天文台 Jade Scope Observatory
- ↳ 天文物理 Astrophysics
- ↳ 業餘天文研究專區 Amateur Astronomers' Research Area
- ↳ 天文圖像處理技巧 Astro Image Processing Technique
- ↳ 氣象地理 Weather & Geography
- ↳ 天文活動消息 Astro Activity News
- ↳ 論壇公佈
- 風馬牛
- ↳ 談天說地 Chatting Square
- ↳ 花鳥蟲魚 Natural World
- ↳ 太空科技 Space Technology
- ↳ 3D打印 新工藝技術 3D Printing New Technology
- ↳ 電腦資訊科技 Information Technology
- ↳ 旅遊天地 Travelling around the World
- ↳ 談股說金
- ↳ 網站支援 Technical Support
- 姊妹網站
- ↳ 黃隆網站 wonglung.com
- ↳ 天文家園
- 廠商專區 Telescope Suppliers'Area
- ↳ 香港天文儀器
- ↳ 香港遥控天文有限公司
- ↳ 南京英田
- ↳ 江西智通
- ↳ 開信 Kson
- ↳ 日昇儀器社
- ↳ 巨眼儀器社
- ↳ 觀星者天文儀器社
- ↳ 達氏望遠鏡
- ↳ 哈雷
- ↳ 振旺光電 ( 大眾天文 )
- ↳ 博冠望遠镜( 鵬城光學 )
- ↳ GRUS 天文社
- ↳ 多尼爾公司
- ↳ 括蒼天文
- ↳ 宇隆光電
- ↳ 二手交易場 Second Hand Area
- 天文教室
- ↳ diy 磨制牛頓反射鏡 --- 視頻
- ↳ 赤道儀的安裝--怎樣平衡望遠鏡
- ↳ 自制天文望遠鏡 Making Astronomical Telescope
- ↳ 天文攝影入門 Introduction to Astrophotography
- ↳ 天文數碼攝影入門 Digital Astrophotography ABC
- ↳ 天文觀測入門 Introduction to Astro Observation
- ↳ 月食的觀測 Lunar Eclipse Observation
- ↳ 日食的觀測 Solar Eclipse Observation
- ↳ 星星相識 Stars,Constellations & Telescopes ABC
- 會員專區 Members Only
- ↳ 下載區 Download Area
- 石硤尾官立小學;德明中學校友專區 Old Schoolmates' Area
- ↳ 石硤尾官立小學
- ↳ 德明中學
誰在線上
正在瀏覽這個版面的使用者:沒有註冊會員 和 28 位訪客