2020A&A...640A..40H


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.26CET14:02:39

2020A&A...640A..40H - Astronomy and Astrophysics, volume 640A, 40-40 (2020/8-1)

A plethora of new, magnetic chemically peculiar stars from LAMOST DR4.

HUMMERICH S., PAUNZEN E. and BERNHARD K.

Abstract (from CDS):


Context. Magnetic chemically peculiar (mCP) stars are important to astrophysics because their complex atmospheres lend themselves perfectly to the investigation of the interplay between such diverse phenomena as atomic diffusion, magnetic fields, and stellar rotation. The most up-to-date catalogue of these objects was published a decade ago. Since then, no large scale spectroscopic surveys targeting this group of objects have been carried out. An increased sample size of mCP stars, however, is important for statistical studies.
Aims. The present work is aimed at identifying new mCP stars using spectra collected by the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST).
Methods. Suitable candidates were selected by searching LAMOST DR4 spectra for the presence of the characteristic 5200Å flux depression. Spectral classification was carried out with a modified version of the MKCLASS code and the accuracy of the classifications was estimated by comparison with results from manual classification and the literature. Using parallax data and photometry from Gaia DR2, we investigated the space distribution of our sample stars and their properties in the colour-magnitude diagram.
Results. Our final sample consists of 1002 mCP stars, most of which are new discoveries (only 59 common entries with the Catalogue of Ap, HgMn and Am stars). Traditional mCP star peculiarities have been identified in all but 36 stars, highlighting the efficiency of the code's peculiarity identification capabilities. The derived temperature and peculiarity types are in agreement with manually derived classifications and the literature. Our sample stars are between 100Myr and 1Gyr old, with the majority having masses between 2M and 3M. Our results could be considered as strong evidence for an inhomogeneous age distribution among low-mass (M<3M) mCP stars; however, we caution that our sample has not been selected on the basis of an unbiased, direct detection of a magnetic field. We identified several astrophysically interesting objects: the mCP stars LAMOST J122746.05+113635.3 and LAMOST J150331.87+093125.4 have distances and kinematical properties in agreement with halo stars; LAMOST J034306.74+495240.7 is an eclipsing binary system (Porb=5.1435±0.0012d) hosting an mCP star component; and LAMOST J050146.85+383500.8 was found to be an SB2 system likely comprising of an mCP star and a supergiant component.
Conclusions. With our work, we significantly increase the sample size of known Galactic mCP stars, paving the way for future in-depth statistical studies.

Abstract Copyright: © ESO 2020

Journal keyword(s): stars: chemically peculiar - stars: abundances - binaries: eclipsing

VizieR on-line data: <Available at CDS (J/A+A/640/A40): tablea1.dat tableb1.dat tablec1.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

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 - 2020
#notes
1 TYC 3684-1139-1 * 01 49 40.9978210868 +53 41 34.255246713   12.06 12.18     B7V 2 0
2 LAMOST J023936.01+540059.5 * 02 39 36.018 +54 00 59.59     12.473     A2 2 0
3 TYC 3701-157-1 * 02 59 51.1970898820 +54 03 39.136947344   10.96 10.52     ~ 2 0
4 TYC 3321-881-1 * 03 43 06.7433566966 +49 52 40.802729457   12.86 12.57     ~ 1 0
5 TYC 3313-1279-1 * 03 44 58.3127309734 +46 48 48.775523350   11.54 11.58     ~ 1 0
6 GSC 02368-00808 * 03 50 46.0399325205 +36 36 48.267600241     12.6     B8III: 2 0
7 HD 25706 * 04 06 42.3460789599 +45 46 40.886796829   10.31 10.14     ~ 7 0
8 NGC 1528 OpC 04 15 23 +51 12.9   6.83 6.4     ~ 96 0
9 [KPR2004b] 55 OpC 04 46 24 +55 15.0           ~ 23 0
10 HD 280281 * 05 01 46.8514893531 +38 35 00.805969153   11.64 11.15     A2 2 0
11 TYC 3357-906-1 Pe* 05 09 25.6626143764 +51 24 44.979067825   11.48 11.20     A3mF0 2 0
12 HD 242764 * 05 21 18.9762682669 +32 08 05.846111635   9.85 9.87     ~ 6 0
13 Cl Gulliver 8 OpC 05 22 14 +33 47.5           ~ 4 0
14 HD 281056 * 05 22 59.5500331203 +34 39 44.935198411   10.81 10.68     ~ 4 0
15 HD 35502 SB* 05 25 01.2043036183 -02 48 55.688876503 6.76 7.30 7.34 7.32 7.40 B5IVsnp 108 0
16 TYC 4765-708-1 * 05 28 16.1011517674 -06 38 20.074429425   11.13 10.63     ~ 1 0
17 TYC 1866-861-1 * 05 50 23.8917688388 +26 13 30.285004570   11.74 11.56     ~ 1 0
18 TYC 1316-1858-1 * 05 53 33.9246134375 +18 02 02.955610254   11.10 10.50     F1/2 2 0
19 NGC 2168 OpC 06 08 54 +24 20.0           ~ 462 0
20 TYC 3776-269-1 * 06 22 21.8374272742 +59 56 13.018784272   10.84 10.55     ~ 1 0
21 RL 127 * 06 23 07.9157334229 +26 46 42.036333074   14.34 14.22     B6/8V 7 0
22 HD 256582 * 06 23 48.5325035194 +03 42 03.783010051   10.56 10.01     B7III 3 0
23 TYC 4789-2924-1 * 06 25 29.8462413997 -03 24 11.985478946   12.15 12.03     ~ 1 0
24 C 0643+018 OpC 06 46 36 +01 47.8     9.2     ~ 7 0
25 TYC 1339-558-1 Pe* 06 49 47.9679017774 +20 25 10.823598861   10.18 9.90     A3mF3 2 0
26 TYC 1898-1408-1 * 06 56 47.7773800105 +24 29 58.856268008   10.24 10.17     ~ 1 0
27 V* NY Aur a2* 06 59 20.1273929229 +42 18 53.116947986   6.76 6.67     ~ 93 0
28 TYC 1909-1687-1 * 07 21 18.9296297845 +22 34 22.794709854   10.36 10.35     ~ 5 0
29 HD 63843 Pe* 07 50 41.8053669362 -06 03 38.292329938   10.53 10.25     A1(IV) 16 0
30 LAMOST J082137.47+064401.0 * 08 21 37.4784 +06 44 01.035     13.329     A1 2 0
31 V* V816 Cen dS* 11 37 37.0411005456 -46 42 34.875395453 8.99 8.79 8.03     F8/G0p 292 0
32 BPS BS 16990-0058 * 12 27 46.0075613550 +11 36 35.946588434   12.58 12.69 12.92   ~ 2 0
33 FBS 1554+403 HS* 15 55 49.8498183281 +40 11 44.436035894           sdB 8 0
34 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11760 0
35 Cl Melotte 186 OpC 18 01 06 +02 54.0     3.0     ~ 60 0
36 HD 167288 a2* 18 15 30.2839350939 -23 07 01.744575040   8.68 8.68     A(pSiCr) 18 0
37 HD 225785 Ro* 19 46 54.9316918620 +40 26 00.111313103   9.80 9.74     A0IVn 12 0
38 V* V362 Lac a2* 22 34 07.2786303948 +39 20 07.933825734   8.64 8.68     Ap 53 1
39 V* V436 Cas a2* 23 32 47.6484699647 +57 54 20.108514720   7.72 7.55     A0p 103 0

    Equat.    Gal    SGal    Ecl

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2020.10.26-14:02:39

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