|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ЦЭМИ РАН |
||
Изменения блеска кандидата в протопланетарные объекты HD179821 в 1899-1999 ггстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Архипова В.П., Иконникова Н.П., Носкова Р.И., Сокол Г.В., Шугаров С.Ю.
- Журнал: Astronomy Letters
- Том: 27
- Год издания: 2001
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 156
- Последняя страница: 162
- DOI: 10.1134/1.1351559
- Аннотация: We present photoelectric and photographic observations of the supergiant HD 179821 with a large infrared excess, a candidate for protoplanetary objects. Over, ten years of our UBV observations, the star exhibited semiregular light variations with amplitudes Delta V = 0.10 mag, B = 0.15 mag, and U = 0.25 mag, as well as systematic color and light variations. From 1990 until 1996, the yearly mean U-B and B-V color indices decreased by 0.25 and 0.15, respectively. After 1996, the motion of the star in the two-color (B-V)-(U-B) diagram upward and to the left slowed down. The color excess that we derived from our observations, by assuming that the star's spectral type was F3I in the 1990s, is E(B-V) = 1.0. The photographic observations of HD 179821 from 1899 until 1989 show that its brightness mpg generally increased while significantly fluctuating. An analysis of the observational data suggests that HD 179821 is most likely a post-AGB star of intermediate or low mass.
- Добавил в систему: Иконникова Наталия Петровна