2025A&A...693L..10M

Query : 2025A&A...693L..10M

2025A&A...693L..10M - Astronomy and Astrophysics, volume 693L10 (2025/1-1)

The IACOB project XIII. Helium enrichment in O-type stars as a tracer of past binary interaction.

MARTINEZ-SEBASTIAN C., SIMON-DIAZ S., JIN H., KESZTHELYI Z., HOLGADO G., LANGER N. and PULS J.

Abstract (from CDS):

There is increasing evidence that single-star evolutionary models are unable to reproduce all of the observational properties of massive stars. Binary interaction has emerged as a key factor in the evolution of a significant fraction of massive stars. In this study, we investigate the helium (YHe) and nitrogen (ϵN) surface abundances in a comprehensive sample of 180 Galactic O-type stars with projected rotational velocities of ≤150 km s–1. We found a subsample (∼20% of the total, and ∼80% of the stars with YHe ≥ 0.12) with a YHe and ϵN combined pattern that is unexplainable by single-star evolution. We argue that the stars with anomalous surface abundance patterns are binary interaction products.

Abstract Copyright: © The Authors 2025

Journal keyword(s): stars: abundances - stars: atmospheres - binaries: general - stars: evolution - stars: massive

Simbad objects: 39

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Number of rows : 39
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 HD 225146 s*b 00 03 57.5025246576 +61 06 13.094034012 8.32 8.96 8.60     O9.7Iab 95 0
2 BD+57 247 * 01 19 10.2720173016 +58 20 57.096955392 9.45 10.14 9.93     O9.7IV 35 0
3 HD 12323 SB* 02 02 30.1268458032 +55 37 26.372271540 7.95 8.87 8.92     ON9.2V 193 0
4 HD 12993 V* 02 09 02.4741997056 +57 55 55.948483236 8.38 9.13 8.98     O6.5V((f))Nstr 154 0
5 HD 14633 SB* 02 22 54.2923246536 +41 28 47.724359448 6.14 8.79 8.73 8.69   ON8.5V 241 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
7 * ups Ori SB* 05 31 55.8599595648 -07 18 05.535884975 3.30 4.36 4.63 4.75 5.01 O9.7V 426 0
8 * del Ori ** 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 O9.5IINwk 796 0
9 NAME Gal Anticenter reg 05 46 +28.9           ~ 1024 0
10 * mu. Col V* 05 45 59.8950238944 -32 18 23.162261796 3.84 4.90 5.18 5.30 5.57 O9.5V 523 0
11 HD 44597 * 06 23 28.5386913264 +20 23 31.655646420 8.59 9.23 9.05     O9.2V 50 0
12 HD 256725 * 06 25 01.3005521328 +19 50 56.120893548 9.34 9.94 9.59 9.96   O5V((fc)) 38 0
13 HD 48279 * 06 42 40.5471009337 +01 42 58.252284586 7.26 8.02 7.96 8.72   O8.5VzNstrvar? 173 0
14 HD 63005 * 07 45 49.0332176232 -26 29 31.436407572 8.29 9.12 9.13 9.64   O6.5IV 89 0
15 CD-35 4384 ** 08 15 17.156 -35 44 14.72 9.06 10.02 9.63 9.56 8.99 O9.2III 32 0
16 HD 69464 s*b 08 15 48.5652200520 -35 37 52.863334428 8.47 9.11 8.80 9.42   O7Ib(f) 108 0
17 HD 75222 s*b 08 47 25.1378783304 -36 45 02.670440616 7.24 7.80 7.42 8.22   O9.7Iab 102 0
18 HD 76341 Em* 08 54 00.6139723224 -42 29 08.763425340 6.88 7.392 7.163 8.08   O9.2IV 118 1
19 HD 90273 * 10 23 44.4543211632 -57 38 31.534939032 8.35 9.25 9.05 9.58   ON7V((f)) 91 0
20 HD 93027 Y*O 10 43 17.9451218184 -60 08 03.279537240 7.86 8.72 8.72 9.48   O9.5IV 90 0
21 Cl Trumpler 14 9 Y*? 10 43 55.3595921208 -59 32 48.868422180 9.282 10.102 9.902 9.31 9.45 O8.5V 21 0
22 HD 305523 * 10 44 29.4771423744 -59 57 18.094514724 7.82 8.64 8.50 9.25   O9II-III 77 0
23 HD 105627 SB* 12 09 44.5819662312 -62 34 54.626272356 7.31 8.21 8.19 9.05   O9III 88 0
24 HD 117797 * 13 34 11.9821045680 -62 25 01.783706880 9.13 9.68 9.20 9.56   O7.5fp 59 0
25 HD 152247 SB* 16 54 11.5173615984 -41 38 30.967835208 6.62 7.35 7.16 8.09   O9.2III 141 0
26 HD 326329 Y*O 16 54 14.1033282720 -41 50 08.503512720 8.141 9.183 9.013 9.477 8.460 O9.7V 78 0
27 HD 152405 SB* 16 54 55.3693932960 -40 31 29.393197572 6.71 7.42 7.29 7.12 6.96 O9.7II 127 1
28 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
29 HD 163758 s*b 17 59 28.3669369416 -36 01 15.589420824 6.46 7.35 7.32 8.38   O6.5Iafp 163 0
30 * 15 Sgr s*b 18 15 12.9063291264 -20 43 41.767600368 4.64 5.42 5.37 5.27 5.19 O9.7Iab 268 0
31 HD 167633 * 18 16 49.6543599336 -16 31 04.308165588 7.69 9.16 9.07 8.91   O6.5V((f)) 85 1
32 BD-11 4586 s*b 18 18 03.3435555624 -11 17 38.830589016 10.26 10.33 9.52     O8Ib(f) 57 0
33 HD 332755 s*b 19 46 38.8217437080 +28 14 37.974918336 8.19 8.93 8.82     O7.5Ib-II 35 0
34 * 9 Sge s*b 19 52 21.7649260368 +18 40 18.751320984 5.32 6.24 6.23     O7.5Iabf 308 1
35 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4590 0
36 HD 190864 Em* 20 05 39.8022808800 +35 36 27.991297908 7.18 7.93 7.78     O6.5III(f) 233 0
37 HD 192639 s*b 20 14 30.4275801672 +37 21 13.816276704 6.83 7.46 7.11     O7.5Iabf 309 0
38 HD 193595 * 20 19 31.3267230384 +39 03 26.230564836 8.5 9.08 8.78     O7V((f)) 64 0
39 HD 202214 ** 21 11 48.23752 +59 59 11.8024 4.97         O9.5IV 150 0

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