ULTRAVIOLET AND INFRARED MONITORING OF FG SAGITTAE DURING 1982-1989 - EVOLUTIONARY STATUS

被引：25

作者：

MONTESINOS, B

CASSATELLA, A

GONZALEZRIESTRA, R

FERNANDEZCASTRO, T

EIROA, C

JIMENEZFUENSALIDA, J

机构：

[1] EUROPEAN SPACE AGCY,IUE OBSERV,MADRID,SPAIN

[2] INST ASTROFIS SPAZIALE,FRASCATI,ITALY

[3] EUROPEAN SPACE TECHNOL CTR,DEPT SPACE SCI,DIV ASTROPHYS,NOORDWIJK,NETHERLANDS

[4] PLANETARIO MADRID,MADRID,SPAIN

[5] OBSERV ASTRON NACL,MADRID,SPAIN

[6] INST ASTROFIS CANARIAS,TENERIFE,SPAIN

来源：

ASTROPHYSICAL JOURNAL | 1990年 / 363卷 / 01期

关键词：

Infrared: sources; Stars individual (FG sagittae); Stars: evolution; Ultraviolet: spectra;

D O I：

10.1086/169335

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 ∼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 ∼100-110±15 days, and it has remained stable since 1979, apart from small fluctuations of ±15 days.

引用

页码：245 / 254

页数：10

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