The intrinsic colors of Wolf-Rayet stars

Nine W-R stars observed in the Carina region have been added to the list of a l Wolf - Rayet stars with known colors in the UBV system. If all these stars (28 stars) are plotted in the (B -V , U-B) diagram, it shows that they are situated in reddening lines which ends in the main sequence between sp...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autor principal: Feinstein, Alejandro
Formato: Articulo Comunicacion
Lenguaje:Español
Publicado: 1965
Materias:
Astronomía
Galaxias
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/92421
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-92421
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Astronomía
Galaxias
spellingShingle Astronomía
Galaxias
Feinstein, Alejandro
The intrinsic colors of Wolf-Rayet stars
topic_facet Astronomía
Galaxias
description Nine W-R stars observed in the Carina region have been added to the list of a l Wolf - Rayet stars with known colors in the UBV system. If all these stars (28 stars) are plotted in the (B -V , U-B) diagram, it shows that they are situated in reddening lines which ends in the main sequence between spectral types BO V and B5 V. The WC stars are always in a reddening line belonging to later spectral type than the WN stars. One W-R star, HD 5Ö896, was observed in the cluster Cr 121. This star with Mᵥ= -2, according to the color-magnitude diagram of the cluster (Feinstein, unpublished), is in the main sequence very near the turn-off point where the stars begin to evolve to the red giants. The cluster is very young and its diagram is the same as that of h and χ Persei. In NGC 6321 there are two W-R stars. This cluster observed by Kron and Breckinridge in the PV system, and by Feinstein in the UBV system (unpublished), shows that these two stars are also at the turn-off point. The absolute magnitude of both are around Mᵥ= -4.5. Two of those stars are present above both W-R objects. The fact that some W-R are members of clusters, is also confirmed by Westerlund who found this kind of stars in three clusters of LMC. All are on the main sequence and very near the point where the evolution proceeds to the giants. The absolute magnitude is around -6. Andrillat showed that the field W-R stars have absolute magnitudes in a range between Mᵥ= -1.5 and -5, so that these stars display a large spread in absolute magnitude. As this fact is confirmed in clusters, and they are also always near the turn-off point, it seems that the condition of W-R stage is connected in some way with the beginning of the evolution to the red giants. Then, any main sequence star may be a W-R in the range of absolute magnitude between -1 and -6.
format Articulo
Comunicacion
author Feinstein, Alejandro
author_facet Feinstein, Alejandro
author_sort Feinstein, Alejandro
title The intrinsic colors of Wolf-Rayet stars
title_short The intrinsic colors of Wolf-Rayet stars
title_full The intrinsic colors of Wolf-Rayet stars
title_fullStr The intrinsic colors of Wolf-Rayet stars
title_full_unstemmed The intrinsic colors of Wolf-Rayet stars
title_sort intrinsic colors of wolf-rayet stars
publishDate 1965
url http://sedici.unlp.edu.ar/handle/10915/92421
work_keys_str_mv AT feinsteinalejandro theintrinsiccolorsofwolfrayetstars
AT feinsteinalejandro intrinsiccolorsofwolfrayetstars
bdutipo_str Repositorios
_version_ 1764820490743971843

Ejemplares similares