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Query : 2006ApJ...638..454P |
2006ApJ...638..454P - Astrophys. J., 638, 454-471 (2006/February-2)
An analysis of ultraviolet spectra of extreme helium stars and new clues to their origins.
PANDEY G., LAMBERT D.L., JEFFERY C.S. and RAO N.K.
Abstract (from CDS):
The initial metallicity of an EHe is indicated by the abundance of elements from Al to Ni; Fe is adopted to be the representative of initial metallicity. Iron abundances range from approximately solar to about 1/100 solar. Clues to EHe evolution are contained within the H, He, C, N, O, Y, and Zr abundances. Two novel results are (1) the O abundance for some stars is close to the predicted initial abundance yet the N abundance indicates almost complete conversion of initial C, N, and O to N by the CNO cycles; and (2) three of the seven stars with UV spectra show a strong enhancement of Y and Zr attributable to an s-process.
The observed compositions are discussed in light of expectations from accretion of an He white dwarf by a C-O white dwarf. Qualitative agreement seems likely except that a problem may be presented by those stars in which the O abundance is close to the initial O abundance.
Abstract Copyright: ∼
Journal keyword(s): Stars: Abundances - Stars: Chemically Peculiar - Stars: Evolution
Simbad objects: 19
Number of rows : 19 |
N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 2MASS J06544616-1048325 | pA* | 06 54 46.1643701544 | -10 48 32.601721752 | 12.99 | 12.27 | 12.08 | OB+ | 19 | 0 | ||
2 | V* DN Leo | Pu* | 10 38 55.2343433712 | +10 03 48.486337812 | 9.76 | 9.93 | Bp | 144 | 0 | |||
3 | V* DY Cen | RC* | 13 25 34.0847063328 | -54 14 43.129581792 | 12.00 | C-Hd/B5-6Ie | 96 | 0 | ||||
4 | V* BX Cir | Pu* | 14 01 36.4829811264 | -66 09 56.163698820 | 11.79 | 12.62 | 12.58 | 12.75 | OB+ | 59 | 0 | |
5 | V* V821 Cen | Pu* | 14 14 58.6292612424 | -46 17 19.294106424 | 9.09 | 9.89 | 9.98 | (B)p | 138 | 0 | ||
6 | HD 144941 | pA* | 16 09 24.5513020968 | -27 13 38.184011148 | 9.45 | 10.17 | 10.02 | B8 | 88 | 1 | ||
7 | V* V2205 Oph | Pu* | 16 28 35.3724415104 | -09 19 31.849139568 | 9.79 | 10.56 | 10.5 | B | 97 | 0 | ||
8 | V* V652 Her | pA* | 16 48 04.6934854032 | +13 15 42.420402252 | 10.31 | 10.51 | ~ | 137 | 0 | |||
9 | CD-46 11775 | pA* | 17 42 33.9915492936 | -46 58 48.829063584 | 11.14 | 11.27 | OB+ | 37 | 0 | |||
10 | 2MASS J17442550-1937537 | pA* | 17 44 25.5054075744 | -19 37 53.754611844 | 12.8 | 12.60 | 12.62 | OB+ | 21 | 0 | ||
11 | LS IV -01 2 | Pu* | 17 51 26.8365068760 | -01 43 21.127711008 | 10.88 | 11.4 | 10.9 | OB+ | 45 | 0 | ||
12 | V* V4334 Sgr | CV* | 17 52 32.69352 | -17 41 08.0160 | F2Ia | 372 | 0 | |||||
13 | V* NO Ser | Pu* | 18 03 55.5266289144 | -01 00 23.228086608 | 10.53 | 10.7 | 10.3 | B | 58 | 0 | ||
14 | LS IV +06 2 | HS* | 18 06 55.4522031744 | +06 21 57.246453756 | 12.11 | 12.14 | 12.32 | sdBC1VHe39 | 33 | 0 | ||
15 | V* PV Tel | s?b | 18 23 14.6623123440 | -56 37 44.138664012 | 8.60 | 9.20 | 9.30 | B5?I?pec | 123 | 0 | ||
16 | V* V4732 Sgr | Pu* | 18 59 39.5771671848 | -14 26 17.543500548 | 11.19 | 11.5 | 10.9 | OB+ | 36 | 0 | ||
17 | V* V1920 Cyg | Pu* | 19 45 17.2712347176 | +33 58 26.596281540 | 9.81 | 10.41 | 10.18 | 10.134 | B2/3 | 48 | 0 | |
18 | Hen 1-5 | pA* | 20 11 56.0595568008 | +20 20 04.420944132 | 11.41 | 10.66 | 9.45 | G8/K0Iae | 507 | 0 | ||
19 | V* FQ Aqr | Pu* | 20 51 21.3360113136 | +02 18 46.360439064 | 9.18 | 9.62 | 9.52 | F | 63 | 0 |
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