1998A&A...340..476J


Query : 1998A&A...340..476J

1998A&A...340..476J - Astronomy and Astrophysics, volume 340, 476-482 (1998/12-2)

Spectral analysis of the low-gravity extreme helium stars LSS 4357, LS II+33 5 and LSS 99.

JEFFERY C.S., HAMILL P.J., HARRISON P.M. and JEFFERS S.V.

Abstract (from CDS):

We have carried out quantitative analyses of three very low surface gravity extreme helium stars with very similar spectra. Their effective temperatures of ∼16000K fill a gap in a nearly continuous sequence of extreme helium stars all having similar luminosity-to-mass ratios, but extending from effective temperatures around 12000K to more than 20000K. Because of the low surface gravities and extremely rich line spectra, the model atmosphere calculations have been reviewed, and large-scale spectral synthesis techniques have been introduced to the analyses for the first time. In addition to the high carbon and nitrogen abundances usually seen in extreme helium stars, two of the programme stars have extremely high oxygen abundances, comparable with or greater than their carbon abundances.

Abstract Copyright:

Journal keyword(s): stars: individual: LS II+33 5, LSS 4357, LSS 99 - stars: emission-line, be - stars: chemically peculiar - stars: abundances

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 16876 * 02 41 32.0287194000 -27 30 58.492932372   9.57 8.65     G8III 13 0
2 V* XX Cam RC* 04 08 38.7489702792 +53 21 39.350441448 8.35 8.10 7.27     F8I 133 0
3 V* SU Tau RC* 05 49 03.7301227728 +19 04 21.867600252   10.72 9.10     C1,0_Hd_CH0 150 1
4 2MASS J06544616-1048325 pA* 06 54 46.1643701544 -10 48 32.601721752   12.99 12.27 12.08   OB+ 18 0
5 V* DN Leo Pu* 10 38 55.2343433712 +10 03 48.486337812   9.76 9.93     Bp 141 0
6 V* UX Ant RC* 10 57 09.0588420456 -37 23 55.133370312   12.67 12.37     C-Hd 41 0
7 V* UW Cen RC* 12 43 17.1901954368 -54 31 40.763998596   10.84 10.13     K 110 0
8 V* Y Mus RC* 13 05 48.1948797744 -65 30 46.624502484   11.3 10.50     Fp_Hd 67 0
9 V* DY Cen RC* 13 25 34.0847063328 -54 14 43.129581792     12.00     C-Hd/B5-6Ie 90 0
10 V* BX Cir Pu* 14 01 36.4829811264 -66 09 56.163698820 11.79 12.62 12.58 12.75   OB+ 56 0
11 V* V821 Cen Pu* 14 14 58.6292612424 -46 17 19.294106424 9.09 9.89 9.98     (B)p 136 0
12 V* R CrB RC* 15 48 34.4154827352 +28 09 24.295852440 6.44 6.31 5.71 5.26 5.08 G0Iep 768 0
13 V* RT Nor RC* 16 24 18.6679360920 -59 20 38.565480480   11.34 10.60     R 73 0
14 V* V2205 Oph Pu* 16 28 35.3724415104 -09 19 31.849139568 9.79 10.56 10.5     B 94 0
15 V* RZ Nor RC* 16 32 41.66 -53 15 33.2     10.63     C-Hd 63 0
16 CD-46 11775 pA* 17 42 33.9915492936 -46 58 48.829063584   11.14 11.27     OB+ 36 0
17 2MASS J17442550-1937537 pA* 17 44 25.5054075744 -19 37 53.754611844   12.8 12.60 12.62   OB+ 21 0
18 V* RS Tel RC* 18 18 51.2223564000 -46 32 53.427456132   10.80 9.96     R0 74 1
19 V* PV Tel s?b 18 23 14.6623123440 -56 37 44.138664012 8.60 9.20 9.30     B5?I?pec 117 0
20 V* GU Sgr RC* 18 24 15.5810208792 -24 15 26.353387944   11.40 11.33     R0 61 0
21 V* V348 Sgr pA* 18 40 19.9290428808 -22 54 29.308207716   12.1       B0/1?I?e 179 0
22 V* FH Sct RC* 18 45 14.8470961608 -09 25 36.106185432           C 27 0
23 V* RY Sgr RC* 19 16 32.7668605944 -33 31 20.340212592 6.20 6.27 6.25     Cpec 358 0
24 V* V1920 Cyg Pu* 19 45 17.2712347176 +33 58 26.596281540 9.81 10.41 10.18   10.134 B2/3 46 0
25 V* V482 Cyg RC* 19 59 42.5731664472 +33 59 27.937220100   12.91 11.36   9.029 C-Hd 63 0
26 V* UV Cas RC* 23 02 14.6592341400 +59 36 36.693038052   11.89 11.80     F0/5Ib 56 0

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2022.05.23-10:20:46

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