Ultraviolet and infrared monitoring of FG Sagittae during 1982-1989 - Evolutionary status

Bibcode
1990ApJ...363..245M
DOI
10.1086/169335
Montesinos, Benjamin; Cassatella, Angelo; Gonzalez-Riestra, Rosario; Fernandez-Castro, Telmo; Eiroa, Carlos; Jimenez-Fuensalida, J.
Bibliographical reference

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 363, Nov. 1, 1990, p. 245-254.

Advertised on:
11
1990
Journal
Astrophysical Journal
Number of authors
6
IAC number of authors
1
Citations
29
Refereed citations
25
Description
Ultraviolet IUE spectra and infrared JHKL photometry of FG Sge obtained over the period 1982-1989 indicate that the cooling rate of the star observed until about 1980 seems to have stopped and that an increase of the effective temperature may have occurred, this being a significant change in the evolutionary path traced so far. The current spectral type of FG Sge is F6-7 I, as deduced from UV data. There is evidence of the existence of an envelope responsible for the infrared excesses observed at longer wavelengths. The short-term variation period is about 100-110 + or - 15 days, and it has remained stable since 1979, apart from small fluctuations of + or - 15 days.
Type
Refereed
Infrared astronomy
Planetary nebulae
Stellar evolution
Supergiant stars
Ultraviolet astronomy
Variable stars

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