Study of chemically peculiar stars - I. High-resolution spectroscopy and K2 photometry of Am stars in the region of M44

被引：6

作者：

Joshi, Santosh ^{[1
]}

Trust, Otto ^{[2
]}

Semenko, E. ^{[3
,4
]}

Williams, P. E. ^{[5
]}

Lampens, P. ^{[6
]}

De Cat, P. ^{[6
]}

Vermeylen, L. ^{[6
]}

Holdsworth, D. L. ^{[7
]}

Garcia, R. A. ^{[8
,9
]}

Mathur, S. ^{[10
,11
]}

Santos, A. R. G. ^{[12
,13
]}

Mkrtichian, D. ^{[3
]}

Goswami, A. ^{[14
]}

Cuntz, M. ^{[15
]}

Yadav, A. P. ^{[16
]}

Sarkar, M. ^{[1
]}

Bhatt, B. C. ^{[14
]}

Alicavus, F. Kahraman ^{[17
,18
]}

Nhlapo, M. D. ^{[19
]}

Lund, M. N. ^{[20
]}

Goswami, P. P. ^{[14
]}

Savanov, I ^{[21
]}

Jorissen, A. ^{[22
]}

Jurua, E. ^{[2
]}

Avvakumova, E. ^{[23
]}

Dmitrienko, E. S. ^{[24
]}

Chakradhari, N. K. ^{[25
]}

Das, M. K. ^{[26
]}

Chowdhury, S. ^{[17
]}

Abedigamba, O. P. ^{[19
,27
]}

Yakunin, I ^{[4
]}

Letarte, B. ^{[19
]}

Karinkuzhi, D. ^{[28
]}

机构：

[1] Aryabhatta Res Inst Observat Sci, Manora Peak 263002, Nainital, India

[2] Mbarara Univ Sci & Technol, Dept Phys, POB 1410, Mbarara, Uganda

[3] Natl Astron Res Inst Thailand, Chiangmai 50180, Thailand

[4] Russian Acad Sci, Special Astrophys Observ, Nizhnii Arkhyz 369167, Russia

[5] George Mason Univ, Affiliate Fac, Phys & Astron Dept, Fairfax, VA 22030 USA

[6] Royal Observ Belgium, Ringlaan 3, B-1180 Brussels, Belgium

[7] Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England

[8] Univ Paris Saclay, CEA, F-91191 Gif Sur Yvette, France

[9] Univ Paris Saclay, Univ Paris Diderot, Sorbonne Paris Cite, CNRS,AIM,CEA, F-91191 Gif Sur Yvette, France

[10] Univ La Laguna ULL, Dept Astrofis, E-38206 San Cristobal la Laguna, Spain

[11] Inst Astrofis Canarias IAC, E-38205 San Cristobal la Laguna, Spain

[12] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[13] Space Sci Inst, 4765 Walnut St,Suite B, Boulder, CO 80301 USA

[14] Indian Inst Astrophys, Bangalore 560034, Karnataka, India

[15] Univ Texas Arlington, Dept Phys, Arlington, TX 76019 USA

[16] Natl Inst Technol, Dept Phys & Astron, Rourkela 769008, Odisha, India

[17] Copernicus Astron Ctr, Banycka 18, PL-00716 Warsaw, Poland

[18] Canakkale Onsekiz Mart Univ, Fac Sci & Arts, Phys Dept, TR-17100 Canakkale, Turkey

[19] North West Univ, Ctr Space Res, ZA-2531 Potchefstroom, South Africa

[20] Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus, Denmark

[21] Russian Acad Sci, Inst Astron, Moscow 119017, Russia

[22] Univ Libre Bruxelles, Inst Astron & Astrophys, Blvd Triomphe, B-1050 Brussels, Belgium

[23] Ural Fed Univ, Kourovka Astron Observ, Ekaterinburg 620000, Russia

[24] Moscow MV Lomonosov State Univ, PK Shternberg State Astron Inst, Moscow 119234, Russia

[25] Pt RS Univ, Sch Studies Phys & Astrophys, Raipur 492010, Madhya Pradesh, India

[26] Univ Delhi, Inst Informat & Commun, South Campus, New Delhi 110021, India

[27] Kyambogo Univ, Dept Phys, POB 1, Kampala, Uganda

[28] Indian Inst Sci IISc, Bengaluru 560012, India

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 510卷 / 04期

基金：

英国科学技术设施理事会;

关键词：

techniques: photometric; spectroscopic; polarimetric; stars: chemically peculiar; stars: activity; stars: binaries; MAGNETIC-FIELD; ECHELLE SPECTROGRAPH; ECLIPSING BINARIES; DIFFUSION-MODELS; HEARTBEAT STAR; MAIN-SEQUENCE; CAPE SURVEY; F-STARS; KEPLER; PRAESEPE;

D O I：

10.1093/mnras/stab3158

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a study based on the high-resolution spectroscopy and K2 space photometry of five chemically peculiar stars in the region of the open cluster M44. The analysis of the high-precision photometric K2 data reveals that the light variations in HD 73045 and HD 76310 are rotational in nature and caused by spots or cloud-like co-rotating structures, which are non-stationary and short-lived. The time-resolved radial velocity measurements, in combination with the K2 photometry, confirm that HD 73045 does not show any periodic variability on time-scales shorter than 1.3 d, contrary to previous reports in the literature. In addition to these new rotational variables, we discovered a new heartbeat system, HD 73619, where no pulsational signatures are seen. The spectroscopic and spectropolarimetric analyses indicate that HD 73619 belongs to the peculiar Am class, with either a weak or no magnetic field, considering the 200-G detection limit of our study. The least-squares deconvolution profiles for HD 76310 indicate a complex structure in its spectra, suggesting that this star is either part of a binary system or surrounded by a cloud shell. When placed in the Hertzsprung-Russell diagram, all studied stars are evolved from the main sequence and situated in the delta Scuti instability strip. This work is relevant for further detailed studies of chemically peculiar stars, for example on inhomogeneities (including spots) in the absence of magnetic fields and the origin of the pulsational variability in heartbeat systems.

引用

页码：5854 / 5871

页数：18

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