AAVSO Alert Notice 474
Multiwavelength Campaign on delta Ori (Mintaka) December 14, 2012
An international team of astronomers, including Drs. Tony Moffat (University of Montreal), Michael Corcoran (NASA GSFC), and Noel Richardson (University of Montreal), has requested AAVSO photometry and spectroscopy of delta Ori (Mintaka) in support of their multiwavelength campaign on this hot binary star in Orion's Belt. Satellite observations will include x-ray via NASA's Chandra and precision optical photometry via Canada's MOST.
***Chandra and MOST observations will be carried out
2012 DECEMBER 17 through 2013 JANUARY 7
so coverage is critical throughout this period, and is also needed before and after this period.***
The astronomers write: "...we make a plea to the astronomical community to obtain simultaneous complementary ground-based optical observations of the key bright hot binary star delta Orionis (Mintaka, one of the belt stars) in the period between mid December 2012 and early January 2013. Both multi-band photometry and especially spectroscopy would be most welcome."
They write further: "Massive O-type stars, though rare, are a primary driver behind the chemical, ionization and pressure evolution of the interstellar medium. Evolution of these stars from main sequence to supernova is driven significantly by stellar-wind mass loss. Understanding this important connection in individual stars requires a good understanding of the physical stellar parameters...combined with detailed understanding of the outflowing wind... Because massive stars are rare, and massive binaries rarer still...dynamical determinations of stellar parameters are only known for a few systems. Our uncertainties regarding mass loss are even worse... Important questions...have not yet been answered." For a more complete description of this campaign, please see the file Mintaka.pdf on the AAVSO Alert Notice 474 webpage (www.aavso.org/aavso-alert-notice-474).
Del Ori (Mintaka, 2.41V, (B-V) -0.40) is the belt star closest to gam Ori (Bellatrix) and bet Ori (Rigel). The del Ori system contains multiple stars and visually is a double star, so be careful not to include the fainter star when making observations.
Photometry: At second magnitude (visual), del Ori is ideally suited to multicolor and near-infrared photoelectric photometry and DSLR photometry, and is a candidate for successful CCD photometry. The extremely small range of this system (2.20-2.32 V) makes visual detection of the brightness changes very difficult.
BVRIJH photometry is requested, ideally 100 data points per night obtained from an average of three measurements per data point. Be sure to include the standard deviation for each set of three measurements (i.e., each data point). Magnitudes should be measured to 0.001, and the JD reported to four places.
Gam Ori (Bellatrix, 1.64V, (B-V) -0.22) should be used as the comparison star.
Spectroscopy: Spectroscopy is strongly encouraged. Observers are requested to use S/N >= 200, R >=10000, integration < 30 min, and range 4000-7000 Å. Observations of Hydrogen alpha (6563 Å) and Helium I (6678 Å) are also requested.
Coordinates for del Ori: RA 05 32 00.40 Dec -00:17:56.7 (2000.0)
Charts for del Ori may be created using the AAVSO Variable Star Plotter (www.aavso.org/vsp). Best results will be obtained by specifying an 'A' scale chart and including no other variables on the chart. Photometrists should use the table accompanying this chart.
Please use the name "DEL ORI" when reporting observations and submit photometric observations to the AAVSO International Database. Spectroscopy should be submitted directly to Dr. Noel Richardson at <richardson@astro.umontreal.ca>.
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/observing/submit/
ALERT NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION
An Alert Notice archive is available at the following URL:
http://www.aavso.org/publications/alerts/
Subscribing and Unsubscribing may be done at the following URL:
http://www.aavso.org/publications/email/
Multiwavelength Campaign on delta Ori
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 8 位訪客