Автор Тема: Необычный объект HD 109962  (Прочитано 3972 раз)

0 Пользователей и 1 Гость просматривают эту тему.

Оффлайн ctac

  • Сотрудник ФПА Ка-Дар
  • *****
  • Сообщений: 8673
  • Короткий Стас
    • ICQ клиент - 340303332
    • Yahoo клиент - astrostas83
    • Просмотр профиля
    • E-mail
Необычный объект HD 109962
« : 22 Февраль 2006, 18:13:08 »

 Хоть и не нова новость, но интересна!

 >                                                Circular No. 8663
>
> Central Bureau for Astronomical Telegrams
> INTERNATIONAL ASTRONOMICAL UNION
> Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
> IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
> CBAT@CFA.HARVARD.EDU (science)
> URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
> Phone 617-495-7440/7244/7444 (for emergency use only)
>
>
> HD 109962
>
>      F. Walter, Stony Brook University; H. E. Bond, Space Telescope
> Science Institute; and A. Pasten, Cerro Tololo Interamerican
> Observatory, report that a spectrum of HD 109962 (= NSV 19448),
> obtained with the SMARTS 1.5-m telescope on Jan. 16.2 UT, shows He
> II 468.6-nm emission (equivalent width -0.29 nm) and possible weak
> emission at the 464.0-nm C III/N III feature (equivalent width
> -0.12 nm) superposed on the star's F2 V spectrum.  In a second
> spectrogram obtained on Jan. 19.3, however, the high-excitation
> emission is absent.  As described by S. Otero
> (http://ar.geocities.com/varsao/NSV_19448.htm), HD 109962 is an
> eclipsing binary with a period of 0.89 days that additionally shows
> outbursts of about 0.8 mag and duration about 40 days occurring
> about once a year, according to ASAS-3 data, with the latest
> outburst having begun in late December 2005.  The variable He II
> emission suggests a close compact companion undergoing a transient
> accretion episode, or one that was eclipsed during the second
> spectrogram.  Observations at all wavelengths, including x-ray and
> ultraviolet, are encouraged.
>
Короткий Стас
 www.astroalert.su - новости!
 www.astromap.ru - Всё астрономические организации РФ и ближнего зарубежья