2024A&A...687A.176K

Query : 2024A&A...687A.176K

2024A&A...687A.176K - Astronomy and Astrophysics, volume 687A176 (2024/7-1)

Chemically peculiar stars on the pre-main sequence.

KUESS L., PAUNZEN E., FALTOVA N., JADLOVSKY D., LABAJ M., MESARC M., MONDAL P., PRISEGEN M., RAMEZANI T., SUPIKOVA J., SVACINKOVA K., VITKOVA M., XIA C., BERNHARD K. and HUMMERICH S.

Abstract (from CDS):

Context. The chemically peculiar (CP) stars of the upper main sequence are defined by spectral peculiarities that indicate unusual elemental abundance patterns in the presence of diffusion in the calm, stellar atmospheres. Some of them have a stable local magnetic field of up to several kiloGauss. The pre-main-sequence evolution of these objects is still a mystery and contains many open questions.
Aims. We identify CP stars on the pre-main sequence to determine possible mechanisms that lead to the occurrence of chemical peculiarities in the (very) early stages of stellar evolution.
Methods. We identified likely pre-main-sequence stars by fitting the spectral energy distributions. The subsequent analysis using stellar spectra and photometric time series helped us to distinguish between CP and non-CP stars. Additionally, we compared our results to the literature to provide the best possible quality assessment.
Results. Out of 45 candidates, about 70% seem to be true CP stars or CP candidates. Furthermore, 9 sources appear to be CP stars on the pre-main sequence, and all are magnetic. We finally report a possible CP2 star that is also a pre-main-sequence star and was not previously in the literature.
Conclusions. The evolution of the peculiarities seems to be related to the (strong) magnetic fields in these CP2 stars.

Abstract Copyright: © The Authors 2024

Journal keyword(s): stars: chemically peculiar - stars: magnetic field - stars: variables: general

Simbad objects: 78

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Number of rows : 78
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 NGC 1333 OpC 03 29 09.2 +31 20 59           ~ 1575 1
2 BD+30 549 Or* 03 29 19.7773614209 +31 24 57.044926178 10.81 10.95 10.47 10.587   B8/9V 129 0
3 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
4 HD 281161 * 03 45 47.8900378032 +32 00 58.550918508   10.23 9.88     ~ 22 0
5 V* V499 Per a2* 03 52 24.7315991880 +34 27 48.749295564   9.66 9.53     B9.4pSrCrSi 33 0
6 HD 24321 * 03 53 32.5018746902 +35 03 35.991961556   8.89 8.80     B8V 35 0
7 NGC 1502 27 * 04 07 40.8117484272 +62 15 40.595371128 12.92 12.98 12.44 12.30   B5V 15 0
8 NGC 1502 OpC 04 07 49.4 +62 19 35   7.47 6.9     ~ 202 1
9 HD 34427 * 05 17 38.9549711304 +07 09 02.970208944   8.75 8.73     ~ 18 0
10 HD 36918 * 05 34 49.1226628608 -06 00 22.931336556 7.69 8.19 8.26     B8.3 66 0
11 NGC 1980 OpC 05 35 15.5 -05 55 46     2.5     ~ 132 0
12 Cl Collinder 69 OpC 05 35 32.1 +09 44 02     2.8     ~ 369 0
13 HD 37035 Y*O 05 35 58.2527671344 +09 31 54.181204896   8.60 8.63     B9 41 0
14 HD 37111 * 05 36 05.8734764952 -00 19 41.553491340   8.86 8.83     A0V 41 0
15 OCSN 61 OpC 05 36.6 -00 27           ~ 7 0
16 * sig Ori Y*O 05 38 44.7653828520 -02 36 00.283179888 2.54 3.58 3.79 3.87 4.11 O9.5V+B0.2V(n) 855 0
17 HD 37525 Y*O 05 39 01.4927799048 -02 38 56.364214344   7.98 8.06   8.210 B5V 95 1
18 TYC 4795-1549-1 Pe* 06 08 12.7020989880 -06 11 44.432389392   11.29 11.19     B6IVSi 4 0
19 V* V1356 Ori a2* 06 08 24.1247449056 +13 56 47.872901400   10.0 10.855 10.76   A0V 51 0
20 NGC 2169 OpC 06 08 31.0 +13 57 46   5.99 5.9     ~ 173 0
21 UBC 438 OpC 06 19 21.5 +15 18 09           ~ 12 0
22 ATO J094.8563+15.3365 a2* 06 19 25.5115124927 +15 20 11.706965326           B9VeSrSiEu 7 0
23 NGC 2232 OpC 06 27 45.6 -04 44 26           ~ 212 0
24 V* V682 Mon a2* 06 28 10.7659506576 -04 53 56.511231684   7.85 7.97     ApSi 100 0
25 NGC 2244 121 Y*O 06 31 54.7272137352 +04 56 38.440615236   12.968 12.449   11.72 ~ 20 0
26 NGC 2244 OpC 06 32 06.9 +04 54 19           ~ 673 1
27 Cl Collinder 106 OpC 06 37 02.6 +05 59 54     4.6     ~ 55 0
28 V* V649 Mon El* 06 37 10.4177682408 +06 03 33.024691548 6.79 7.53 7.59     B1III 35 0
29 Gaia DR3 3131891973309856640 Pe* 06 37 11.4847968911 +06 03 25.419801483           B7-8VEu 2 0
30 HD 47129 SB* 06 37 24.0420854544 +06 08 07.369104444 5.23 6.11 6.06     O8I+O7.5III 420 0
31 HD 261878 Y*O 06 40 51.5561543448 +09 51 49.380647832 8.42 8.98 9.08 9.149 9.191 B6V 73 0
32 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
33 HD 262013 Y*O 06 41 12.9352165416 +09 35 49.916028588 8.75 9.15 9.21   9.229 B9V 56 0
34 BD-11 1762 * 07 03 54.4249106064 -11 28 29.388376380 9.6 10.14 10.05     B2IV-Vn 29 0
35 HD 68450 * 08 11 01.6832319648 -37 17 32.549289720 5.58 6.42 6.44 7.43   O9.7II 142 0
36 Cl Gulliver 2 OpC 08 11 36.5 -37 23 51           ~ 18 0
37 2MASS J08214236-4205214 * 08 21 42.3669104856 -42 05 21.395809356     13.72     Ap 6 0
38 NAME Majaess 99 OpC 08 21 45.00 -42 04 55.0           ~ 6 0
39 CWNU 1083 OpC 08 22 40.1 -41 31 29           ~ 4 0
40 HD 71016 Y*O 08 23 30.9369126408 -41 02 00.496306536   9.81 9.68     A1V 17 0
41 HD 107696 * 12 22 49.4317993896 -57 40 34.068874692   5.269 5.366     B7Vn 77 0
42 Cl Stock 16 OpC 13 19 26.4 -62 37 19           ~ 95 0
43 Cl Hogg 16 OpC 13 29 18 -61 12.0           ~ 69 0
44 V* V913 Sco Ro* 15 58 34.8665694960 -24 49 53.361727284 4.70 5.34 5.43     B5V 226 0
45 OCSN 96 OpC 16 01.1 -22 55           ~ 9 0
46 V* V933 Sco a2* 16 20 05.4927999744 -20 03 23.030685720   7.56 7.40     B8:VpSrTiSiEu 204 0
47 NGC 6178 OpC 16 35 42.5 -45 38 11           ~ 78 0
48 HD 149257 * 16 35 45.4515816840 -45 37 16.413043908 7.67 9.46 9.18 9.38   B1Ib 54 0
49 HD 149277 SB* 16 35 48.1576287288 -45 40 43.537136484 7.77 8.41 8.41     B2VeHe 59 0
50 V* V1062 Sco a2* 16 38 30.9410484900 -39 09 08.389193766   6.92 6.95     ApSi 78 0
51 CD-48 11051 * 16 40 33.8980280640 -48 53 16.138367700 10.13 10.74 10.35 10.45   OB: 47 0
52 NGC 6193 OpC 16 41 14.9 -48 46 47           ~ 169 0
53 UPK 640 OpC 16 41 18.4 -39 36 44           ~ 28 0
54 NGC 6231 281 Y*? 16 53 52.0599810384 -41 48 54.086756796 11.886 12.230 12.034 12.20 11.619 Ap 14 0
55 CD-41 11023 Y*? 16 54 01.5408522648 -41 49 25.180583160 13.083 13.043 12.736 12.949 12.439 ~ 19 0
56 NGC 6231 OpC 16 54 14.4 -41 48 53           ~ 562 0
57 NGC 6231 168 Y*? 16 54 44.5929493800 -41 47 44.432901060 14.695 14.271 13.746   13.064 ~ 11 0
58 CD-24 13831 Y*O 18 04 25.5554033664 -24 20 44.860145748 9.66 10.29 10.17     B1V 38 0
59 NGC 6530 OpC 18 04 31 -24 21.5           ~ 443 0
60 UPK 39 OpC 18 29.9 +01 00           ~ 5 0
61 Renson 47863 Y*? 18 31 53.0277166754 +01 37 24.989937295   11.88 11.9     ~ 8 0
62 Cl Biurakan 2 OpC 20 09 12.4 +35 29 23           ~ 61 0
63 ATO J302.4654+35.5716 a2* 20 09 51.7087426988 +35 34 18.182340074           ~ 7 0
64 ATO J303.6335+41.1772 a2* 20 14 32.0544562704 +41 10 38.029540726   15.342 14.617 14.114   ~ 5 0
65 [KPS2012] MWSC 3290 OpC 20 15 04 +41 11.1           ~ 11 0
66 UCAC2 46029306 Pu* 20 18 06.9143484744 +40 43 05.632434552   11.36 11.17 11.24   B9V 17 0
67 Cl Collinder 419 OpC 20 18 07.3 +40 44 03           ~ 53 0
68 HD 194613B Pu* 20 22 54.1812726552 +64 11 02.662152864   10.06 9.93     B7V 10 0
69 HD 194613A * 20 22 54.3185278587 +64 10 58.553499467   9.33 9.21 9.368   A0II-IIIpSi 21 0
70 UPK 160 OpC 20 23 20.0 +64 10 44           ~ 2 0
71 UPK 169 OpC 21 47 04.5 +59 47 19           ~ 14 0
72 HD 207538 * 21 47 39.7896725544 +59 42 01.348647696 7 7.55 7.30     O9.7IV 213 1
73 NGC 7160 OpC 21 53 44.8 +62 35 33   6.34 6.1     ~ 243 0
74 NGC 7160 23 Y*? 21 53 52.7507062224 +62 38 04.288336908   13.12 12.66     A4/A5 13 0
75 HD 209339 ** 22 00 39.2649125112 +62 29 16.063886004 5.9 8.73 8.51 7.61   O9.7IV 196 0
76 V* GQ Cep a2* 22 39 22.8991823280 +75 39 27.460915704   8.11 8.15     A0p 68 0
77 [KC2019] Theia 11 As* 22 45 29.4 +75 10 55           ~ 2 0
78 HD 240311 Pe* 23 29 26.1638867376 +59 36 09.821540304   10.75 10.35     A0 21 0

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