2013ApJ...768L..11H

Query : 2013ApJ...768L..11H

2013ApJ...768L..11H - Astrophys. J., 768, L11 (2013/May-1)

Nitrogen isotopes in asymptotic giant branch carbon stars and presolar SiC grains: a challenge for stellar nucleosynthesis.

HEDROSA R.P., ABIA C., BUSSO M., CRISTALLO S., DOMINGUEZ I., PALMERINI S., PLEZ B. and STRANIERO O.

Abstract (from CDS):

Isotopic ratios of C, N, Si, and trace heavy elements in presolar SiC grains from meteorites provide crucial constraints to nucleosynthesis. A long-debated issue is the origin of the so-called A+B grains, as of yet no stellar progenitor thus far has been clearly identified on observational grounds. We report the first spectroscopic measurements of 14N/15N ratios in Galactic carbon stars of different spectral types and show that J- and some SC-type stars might produce A+B grains, even for 15N enrichments previously attributed to novae. We also show that most mainstream grains are compatible with the composition of N-type stars, but in some cases might also descend from SC stars. From a theoretical point of view, no astrophysical scenario can explain the C and N isotopic ratios of SC-, J-, and N-type carbon stars together, as well as those of many grains produced by them. This poses urgent questions to stellar physics.

Abstract Copyright: ∼

Journal keyword(s): nuclear reactions, nucleosynthesis, abundances - stars: carbon - stars: abundances

Simbad objects: 36

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Number of rows : 36
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* WZ Cas C* 00 01 15.8567946264 +60 21 19.025920224 8.77 9.47 7.13     C-N7III: 321 0
2 V* VX And C* 00 19 54.0161311920 +44 42 33.895984824   12.23 7.80     C-J4.5 165 0
3 V* AQ And C* 00 27 31.6830716856 +35 35 14.495266104   11.3 9.90     C-N5+ 121 0
4 V* Z Psc C* 01 16 05.0304050160 +25 46 09.689905056 12.85 9.46 6.84     C-N5 184 0
5 V* U Cam C* 03 41 48.1758504744 +62 38 54.395692404   11.5 11.00     C-N5 254 0
6 V* UV Cam C* 04 05 53.8499371056 +61 47 39.974061552   9.86 7.60     C-J4 107 0
7 V* SY Per C* 04 16 33.1929975216 +50 37 34.603278060   12.72 8.70 8.10   C6,4 84 0
8 V* ST Cam C* 04 51 13.3487495016 +68 10 07.637629620   9.77 9.20     C-N5 152 0
9 V* GP Ori S* 05 02 48.0655541832 +15 19 12.661687128   11.95 12.20     SC7/8 97 0
10 HD 32088 C* 05 03 23.0461903728 +50 37 58.087497252   12.13 8.57     C-N5- 68 1
11 V* W Ori C* 05 05 23.7190712856 +01 10 39.454639032 16.36 9.52 6.10 3.83 2.35 C-N5 300 0
12 V* UV Aur C* 05 21 48.9129714624 +32 30 40.177664388   12.46 10.41 9.15   C8,1Je 223 0
13 V* Y Tau C* 05 45 39.4101366456 +20 41 42.148590324 15.71 9.90 6.90 4.69 3.19 C-N5- 230 1
14 V* BL Ori C* 06 25 28.1742350712 +14 43 19.172149392 11.64 8.31 6.00 4.28 2.98 C-N5- 203 0
15 V* W Cam Mi* 06 25 56.2527034392 +75 27 03.874259052   13.47 11.98     M7 21 0
16 V* UU Aur C* 06 36 32.8371036984 +38 26 43.819021608   7.89 5.25 3.31 1.90 C-N5- 314 1
17 HD 52432 C* 07 01 01.9535075376 -03 15 09.134562744   9.98 8.76 7.65   C-J3.5 113 0
18 V* VX Gem C* 07 12 48.9705620544 +14 36 03.716151984     10.80     C9,1e 92 0
19 V* BM Gem C* 07 20 59.0073521904 +24 59 58.086063708     11.50     C-J5- 155 1
20 HD 57884 C* 07 23 06.9952668648 -04 12 48.791336184   11.7 9.0     C4+,3 53 0
21 V* NQ Gem Sy* 07 31 54.5211878712 +24 30 12.562655904   10.13 7.95     C6,2_CH3 110 0
22 V* X Cnc C* 08 55 22.8819374952 +17 13 52.583009880   9.63 6.40 4.29 2.90 C-N4.5 279 1
23 V* Y CVn C* 12 45 07.8260815656 +45 26 24.926308404 14.03 7.41 4.87 3.12 1.74 C-N5 493 0
24 V* RR Her C* 16 04 13.4079117672 +50 29 56.991501888   11.32 8.80     SC5.5-C71e 88 0
25 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
26 BD+10 3764 C* 19 02 15.1815009648 +10 14 24.678369276   14.38 9.45 8.91   SC6:/9e 39 0
27 V* V Aql C* 19 04 24.1544971752 -05 41 05.444321424   11.09 6.90     C-N5 222 0
28 V* AW Cyg C* 19 28 47.5684705704 +46 02 38.140787184   12.07 11.00     C4,5 93 0
29 V* RS Cyg C* 20 13 23.6616874008 +38 43 44.470030872 13.26 9.36 6.50 4.38 2.82 C-N5.5 187 0
30 V* WX Cyg C* 20 18 33.2742966672 +37 26 59.080236792   12.95 8.80 8.42   C-J6 146 0
31 V* V460 Cyg C* 21 42 01.0830893088 +35 30 36.719916552 12.97 8.32 5.84 4.10 2.71 C-N5 220 1
32 V* LQ Cyg C* 21 46 38.6719753776 +52 34 02.807095116   12.88 10.10     C5-,4 33 0
33 V* RX Peg C* 21 56 22.3386317640 +22 51 42.567075180   11.16 8.14     C-J4.5: 64 1
34 V* RZ Peg Mi* 22 05 52.9706535288 +33 30 24.810555528   11.40 7.60 7.89   SC5-9/9-e 167 0
35 MSB 42 C* 23 23 28.1286107160 +56 10 01.064623476   12.86 9.58     C4,5Je: 47 0
36 * 19 Psc C* 23 46 23.5164473376 +03 29 12.519049272 10.95 7.62 5.02 3.19 1.82 C-N6 462 0

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