1997A&A...319..244U


C.D.S. - SIMBAD4 rel 1.7 - 2020.06.02CEST10:59:07

1997A&A...319..244U - Astronomy and Astrophysics, volume 319, 244-249 (1997/3-1)

Infrared observations of peculiar carbon stars.

ULLA A., THEJLL P., KIPPER T. and JORGENSEN U.G.

Abstract (from CDS):

We present a uniform and high quality set of infrared photometric (JHK) observations of the 6 peculiar carbon giant stars V Ari, UV Cam, BD+34 911, TU Gem, BD+57 2161 and BD+34 4134. All of these belong to the small group of known cool CH giants populating the Galactic halo. Comparison of the J-H and H-K colours to "normal" C stars show our stars to be "bluer" (i.e., having lower values of J-H and H-K) than the bulk of the Galactic C stars. Comparison with synthetic JHK colours reveal 5 of our 6 stars as having considerably lower metallicities and/or higher temperatures than the bulk. Using standard assumptions we derive estimates of their effective temperatures, gravities, luminosities and distances. Their derived luminosities place them close to (or below) the theoretical first He shell flash luminosity, although other observations indicate their carbon excess to be intrinsic.

Abstract Copyright:

Journal keyword(s): stars: evolution - stars: carbon - infrared: stars - stars: fundamental parameters

Status at CDS:  

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V Ari Pe* 02 15 00.0771486824 +12 14 23.613348802   10.8 9.80     C-H3.5 101 0
2 V* UV Cam C* 04 05 53.8492693966 +61 47 39.976105052   9.86 7.60     C-J4 94 0
3 HD 30443 Pe* 04 49 16.0206954611 +35 00 06.478684166   11.2 8.82     C5,3_CH9_CN6.5_Ba7 50 0
4 V* TU Gem C* 06 10 53.1008 +26 00 53.354     9.40     C-N5+ 110 0
5 BD+57 2161 Pe* 20 14 07.7503937767 +58 06 19.420419723   11.3 9.68     C4,1_CH3_Ba4 25 0
6 HD 197604 Pe* 20 43 34.9807100370 +35 04 22.676516166   10.70 9.28     C4,2_CH8 40 0

    Equat.    Gal    SGal    Ecl

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2020.06.02-10:59:07

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