2008ApJ...674.1068P

Query : 2008ApJ...674.1068P

2008ApJ...674.1068P - Astrophys. J., 674, 1068-1077 (2008/February-3)

Fluorine in R Coronae Borealis stars.

PANDEY G., LAMBERT D.L. and RAO N.K.

Abstract (from CDS):

Neutral fluorine (F I) lines are identified in the optical spectra of several R Coronae Borealis stars (RCBs) at maximum light. These lines provide the first measurement of the fluorine abundance in these stars. Fluorine is enriched in some RCBs by factors of 800-8000 relative to its likely initial abundance. The overabundances of fluorine are evidence for the synthesis of fluorine. These results are discussed in the light of the scenario that RCBs are formed by accretion of an He white dwarf by a CO white dwarf. Sakurai's object (V4334 Sgr), a final He-shell flash product, shows no detectable F I lines.

Abstract Copyright: ∼

Journal keyword(s): Stars: Abundances - Stars: Chemically Peculiar - Stars: Evolution

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* DY Per RC* 02 35 17.1274583280 +56 08 44.717128260   12.88 11.09 9.93 8.64 C-R4+ 81 0
2 V* XX Cam RC* 04 08 38.7489702792 +53 21 39.350441448 8.35 8.10 7.27     F8I 145 0
3 V* SU Tau RC* 05 49 03.7301227728 +19 04 21.867600252   10.72 9.10     C1,0_Hd_CH0 157 1
4 V* UX Ant RC* 10 57 09.0588420456 -37 23 55.133370312   12.67 12.37     C-Hd 48 0
5 V* UW Cen RC* 12 43 17.1901954368 -54 31 40.763998596   10.84 10.13     K 123 0
6 V* DY Cen RC* 13 25 34.0847063328 -54 14 43.129581792     12.00     C-Hd/B5-6Ie 105 0
7 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2417 1
8 V* V854 Cen RC* 14 34 49.4024471640 -39 33 19.201288284   7.13 11.69     Ce 214 0
9 V* Z UMi RC* 15 02 01.3633505568 +83 03 48.629861424   12.54 11.40     C 60 0
10 V* S Aps RC* 15 09 24.5365973688 -72 03 45.182766996 11.52 10.86 9.60     C 124 0
11 V* R CrB RC* 15 48 34.4154827352 +28 09 24.295852440 6.44 6.31 5.71 5.26 5.08 G0Iep 798 0
12 V* LV TrA RC* 16 35 45.7879131144 -67 07 36.693992244 9.91 9.26 8.32     C-Hd1II: 70 0
13 V* V2552 Oph RC* 17 23 14.5548283752 -22 52 06.314546712   11.90 10.92     C-Hd 30 0
14 V* V4334 Sgr CV* 17 52 32.69352 -17 41 08.0160           F2Ia 390 0
15 V* V3795 Sgr RC* 18 13 23.5642449000 -25 46 40.857266928       10.940 10.10 ~ 48 0
16 V* VZ Sgr RC* 18 15 08.5724613648 -29 42 29.491053228   11.15 10.46     ~ 57 0
17 V* GU Sgr RC* 18 24 15.5810208792 -24 15 26.353387944   11.40 11.33     R0 70 0
18 V* FH Sct RC* 18 45 14.8470961608 -09 25 36.106185432           C 37 0
19 V* V CrA RC* 18 47 32.3096196393 -38 09 32.307864378       10.765   R0 114 0
20 V* RY Sgr RC* 19 16 32.7668605944 -33 31 20.340212592 6.20 6.27 6.25     Cpec 370 0
21 V* V482 Cyg RC* 19 59 42.5731664472 +33 59 27.937220100   12.91 11.36   9.029 C-Hd 72 0
22 Hen 1-5 pA* 20 11 56.0595568008 +20 20 04.420944132 11.41 10.66 9.45     G8/K0Iae 523 0
23 V* UV Cas RC* 23 02 14.6592341400 +59 36 36.693038052   11.89 11.80     F0/5Ib 68 0

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