1997PASP..109..256M

Query : 1997PASP..109..256M

1997PASP..109..256M - Publ. Astron. Soc. Pac., 109, 256-263 (1997/March-0)

The R stars: carbon stars of a different kind.

McCLURE R.D.

Abstract (from CDS):

begin{tex}After ∼16 years of radial-velocity observations of a sample of 22 R-type carbon stars, no evidence for binary motion has been detected in any of them. This is surprising considering that approximately 20% of normal late-type giants are spectroscopic binaries, and the fraction is close to 100% in barium, CH, and subgiant/dwarf CH and barium stars. It is suggested, therefore, that a process that has caused the mixing of carbon to the surface of these stars cannot act in a wide binary system. Possibly, the R stars were once all binaries, but with separations that would not allow them to evolve completely up the giant and asymptotic giant branchs without coalescing. This coalescence may be the agent which causes carbon produced in the helium-core flash to be mixed outwards to a region where convection zones can bring it to the surface of the star.

Abstract Copyright: ∼

Journal keyword(s): Stars

Simbad objects: 38

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Number of rows : 38
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* NQ Cas C* 00 24 34.8665611152 +54 17 38.287656600   11.10 9.29     C-J4.5 55 0
2 BD+29 95 SB* 00 32 05.1244321584 +30 32 39.001478244   11.4 10.18     C3,0_CH4 30 0
3 BD+21 64 C* 00 34 16.2267216984 +22 24 48.373123428   10.97 9.65     C3,3 34 0
4 HD 16115 Pe* 02 35 06.4987385928 -09 26 34.126056708   9.36 8.15     C-H3II: 77 0
5 HD 19557 C* 03 11 25.3268651352 +57 54 11.223823500   10.04 8.59 7.86   C-J4 101 0
6 HD 19881 C* 03 13 38.6447284488 +47 49 33.876686784   12.36 8.94     C-N5+ 61 0
7 HD 286436 C* 03 58 27.2109145896 +11 54 20.828456208   11.8 10.2     C4,3 28 0
8 BD+23 601 C* 04 00 19.2620675352 +23 32 03.425321760   11.8 10.5     C3,3J 27 0
9 HD 34467 C* 05 19 10.2066115728 +35 47 32.424364356   11.94 9.15 8.81   C6,3 61 0
10 V* SZ Lep C* 05 35 47.7176157744 -25 44 18.526436052 13.11 9.89 7.59     C-N3.5III 60 0
11 BD+33 1194 C* 05 57 08.6478504072 +33 51 36.317763468   11.9 10.4     C2,3 26 0
12 HD 52432 C* 07 01 01.9535075376 -03 15 09.134562744   9.98 8.76 7.65   C-J3.5 113 0
13 HD 57884 C* 07 23 06.9952668648 -04 12 48.791336184   11.7 9.0     C4+,3 53 0
14 HD 58385 C* 07 25 13.0650482856 -03 08 03.332797152   10.81 9.19 9.27   C6,2 35 0
15 HD 58337 C* 07 26 01.9606146576 +21 54 46.013153724   11.0 9.57     C3,3J 32 0
16 HD 58364 C* 07 26 06.5091711864 +21 53 28.207970556   10.67 9.23     C4,3p 38 0
17 V* NQ Gem Sy* 07 31 54.5211878712 +24 30 12.562655904   10.13 7.95     C6,2_CH3 110 0
18 V* W CMi C* 07 48 45.5269558104 +05 23 35.392186536 14.32 11.23 8.72     C7,2 49 1
19 HD 76846 C* 08 59 48.9396931920 +33 46 26.478155532   10.71 9.42     C-R2+IIIa: 56 0
20 V* DH UMa C* 09 03 15.2533415856 +50 05 39.372128772   10.99 9.43     C3.5,5J 48 0
21 V* GM Cnc C* 09 13 50.0827820424 +14 12 39.190270356   10.24 8.57     C4,4J 58 0
22 HD 85066 SB* 09 51 05.3536296240 +52 37 25.436530164   11.48 9.72     C2,3_CH5 39 0
23 BD+02 2446 Pe* 11 33 49.0532018448 +01 45 08.056158336   11.46 10.17 10.04   C3,3_CH4 35 0
24 BD+04 2735 C* 13 23 15.7166086296 +03 43 47.411285232   11.10 9.64     C1,1 28 0
25 HD 122547 Pe* 14 01 55.4735542368 +32 49 33.301523604 11.72 10.77 9.54 8.70 8.07 C3,3_CH4 53 0
26 BD+83 442 Pe* 15 06 50.0120588760 +82 45 23.063333724   11.02 9.97     C2,0+_CH3 24 0
27 BD+30 2637 Pe* 15 17 32.1333854112 +29 36 10.231028748   10.78 9.74     C3,0+_CH4 30 0
28 BD+23 2998 C* 16 47 24.6712810440 +23 12 57.474248868 12.13 11.00 9.80 9.00 8.43 C-R3IIIa: 44 0
29 HD 156074 C* 17 13 31.2405544440 +42 06 22.768253820 9.67 8.75 7.61 6.89 6.42 C-R2III 134 0
30 BD+02 3336 C* 17 31 23.2568620944 +01 58 33.157976772 13.34 11.31 9.40 8.12 7.14 C-N5III: 51 0
31 BD+17 3325 Pe* 17 45 42.7801177728 +17 12 51.677074188 11.04 9.91 8.73 7.92 7.33 C2,0+_CH4: 38 0
32 HD 163838 C* 17 53 42.4853133816 +64 06 56.614638348   11.84 10.72     C2,2 31 0
33 V* FO Ser C* 18 19 21.8140286424 -15 36 46.063194012 12.55 10.55 8.66 6.96 5.53 C-J4+ 66 0
34 HD 333026 C* 19 55 40.0781877216 +28 24 40.931187120   11.30 9.51     R0 18 0
35 HD 197604 Pe* 20 43 34.9805559120 +35 04 22.679960520   10.70 9.28     C4,2_CH8 44 0
36 BD+02 4338 C* 21 19 02.5555583208 +03 14 31.039471392   11.1 9.78     C3,2 35 0
37 HD 218851 C* 23 10 46.1769962976 +46 18 10.666779912   11.23 9.93     C2,2 30 0
38 HD 223392 C* 23 49 05.4856631856 +06 22 56.648814060   9.87 8.50     C-R3III: 50 0

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