J/PASJ/76/1084 MK-like spectral classification (Zou+, 2024)
MK-like spectral classification for hot subdwarf stars with LAMOST spectra.
Zou X., Lei Z.
<Publ. Astron. Soc. Jap. 76, 1084 (2024)>
=2024PASJ...76.1084Z 2024PASJ...76.1084Z (SIMBAD/NED BibCode)
ADC_Keywords: Stars, early-type ; Stars, subdwarf ; MK spectral classification
Keywords: stars: peculiar - stars: statistics - subdwarfs -
spectral classification - hot subdwarfs
Abstract:
An MK-like spectral classification has been conducted for 1224 hot
subdwarf stars with LAMOST DR9 low-resolution spectra. The whole
sample was divided into four categories according to the spectral line
characteristics: He-normal, He-weak, He-strong C, and He-strong. Each
selected spectrum was assigned a spectral class, a luminosity class,
and a helium class by comparing the line depth and width with standard
spectra selected in LAMOST. Relationships between atmospheric
parameters and spectral classification are also presented.
Description:
Table 2 presents main properties of 1224 hot subdwarf stars together
with the MK-like spectral classification obtained in this study.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 121 1224 Main parameters for the 1224 hot subdwarfs with
MK-like spectral classifications in this study
--------------------------------------------------------------------------------
See also:
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 I9 --- ObsID The LAMOST obsid
10- 11 A2 --- n_ObsID [*+ ] Note on LAMOST obsid (1)
13- 25 F13.9 deg RAdeg Right ascension (J2000)
27- 38 F12.9 deg DEdeg Declination sign (J2000)
40- 45 F6.2 --- SNRU Signal-to-Noise Ratio
47- 53 F7.4 mag Gmag Gaia G magnitude
55- 60 F6.4 mag e_Gmag rms uncertainty on Gmag
62- 66 I5 K Teff ?=- Effective temperature
68- 72 I5 K e_Teff ?=- rms uncertainty on Teff
74- 77 F4.2 [cm/s2] logg ?=- Surface gravity
79- 82 F4.2 [cm/s2] e_logg ?=- rms uncertainty on logg
84- 88 F5.2 [-] log(nHe/nH) ?=- Helium abundance (log[N(He)/N(H)] (2)
90- 93 F4.2 [-] e_log(nHe/nH) ?=- Uncertainty flag on log(nHe/nH) (2)
95-101 A7 --- SpClass MK-like Spectral type obtained in
this study
103-106 A4 --- He-class The Helium class obtained in this study
108-111 A4 --- LumClass The luminosity class obtained in
this study
113-116 F4.2 --- SpNum The numerical form of MK-like
Spectral type
118-119 I2 --- HeNum The numerical form of Helium class
121 I1 --- LumNum The numerical form of The luminosity class
--------------------------------------------------------------------------------
Note (1): Note as follows:
* = common object in Drilling et al., 2013A&A...551A..31D 2013A&A...551A..31D, Cat. J/A+A/551/A31
+ = common objects in Jeffery et al. (2021MNRAS.501..623J 2021MNRAS.501..623J)
Note (2): Surface He abundance (i.e., log(nHe/nH)) and their uncertainties
reported in Culpan et al. (2022A&A...662A..40C 2022A&A...662A..40C, Cat. J/A+A/662/A40)
--------------------------------------------------------------------------------
History:
From Xuan Zou, zouxuan202103(at)163.com
Acknowledgements:
We thank the referee for valuable suggestions and comments which
helped improve the manuscript greatly.This work acknowledges support
from the National Natural Science Foundation of China (No. 12073020),
Scientific Research Fund of Hunan Provincial Education Department
grant No. 20K124, Cultivation Project for LAMOST Scientific Payoff and
Research Achievement of CAMS-CAS, the science research grants from the
China Manned Space Project with No. CMS-CSST-2021-B05.Guoshoujing
Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic
Telescope LAMOST) is a National Major Scientific Project built by the
Chinese Academy of Sciences. Funding for the project has been provided
by the National Development and Reform Commission.LAMOST is operated
and managed by the National Astronomical Observatories, Chinese
Academy of Sciences.
(End) Patricia Vannier [CDS] 29-Apr-2025