VARIABILITY OF 4 YELLOW SUPERGIANTS - POSSIBLE PROTOPLANETARY OBJECTS

Authors
ARKHIPOVA VP IKONNIKOVA NP NOSKOVA RI
Citation
Vp. Arkhipova et al., VARIABILITY OF 4 YELLOW SUPERGIANTS - POSSIBLE PROTOPLANETARY OBJECTS, Astronomy letters, 19(3), 1993, pp. 169-172
Citations number
14
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy letters → ACNP
ISSN journal
10637737
Volume
19
Issue
3
Year of publication
1993
Pages
169 - 172
Database
ISI
SICI code
1063-7737(1993)19:3<169:VO4YS->2.0.ZU;2-F
Abstract
We report photoelectric UBV observations of four supergiants with larg e infrared excesses: IRAS 18095+2704 and 19386+0155, and SAO 124414 an d 34504. These are possible precursors of planetary nebula. All of the m revealed brightness variations of 0.2m to 0.5m during the period fro m 1990 to 1992.