NIR spectroscopic study of young M dwarfs Virtual Observatory Resource

Authors
  1. Khata D.
  2. Mondal S.
  3. Das R.
  4. Ghosh S.
  5. Ghosh S.
  6. Published by
    CDS
Abstract

We present here medium resolution ({lambda}/{Delta}{lambda}~1200) H- and K-band spectra of M-type dwarf stars covering the wavelength ranges 1.50-1.80{mu}m and 1.95-2.45{mu}m. The sample includes 53 dwarf stars (M0V-M7V) from new observations using the TIFR Near-Infrared Spectrometer and Imager instrument on the 2-m Himalayan Chandra Telescope. Using interferometrically measured effective temperature (T_eff_), radius and luminosity of nearby bright calibrator stars, we have created new empirical relationships among those fundamental parameters and spectral indices. The equivalent widths of H-band spectral features like Mg (1.57{mu}m), Al (1.67{mu}m) and Mg (1.71{mu}m), and the H_2_O-H index are found to be good indicators of T_eff_, radius and luminosity and we establish linear functions using these features relating to those stellar parameters. The root-mean-squared error of our best fits are 102K, 0.027R_{sun}_ and 0.12dex respectively. Using spectral-type standards along with known parallaxes, we calibrate both H- and K-band H_2_O indices as a tracer of spectral type and absolute K_s_ magnitude. Metallicities of M-dwarf samples are estimated using the K-band calibration relationships. The masses of M dwarfs could be determined using the luminosity (L/L_{sun}_) and we establish a new empirical relation for this. We also compare and contrast our results with other similar work from the literature.

Keywords
  1. m-stars
  2. dwarf-stars
  3. line-intensities
  4. effective-temperature
  5. stellar-masses
  6. stellar-radii
  7. stellar-spectral-types
  8. infrared-astronomy
  9. spectroscopy
Bibliographic source Bibcode
2020MNRAS.493.4533K
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/493/4533
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/493/4533
Document Object Identifer DOI
doi:10.26093/cds/vizier.74934533

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/493/4533
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/493/4533
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/493/4533
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/0?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/493/4533/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/493/4533/table1?

History

2023-07-24T08:43:57Z
Resource record created
2023-07-24T08:43:57Z
Created
2024-08-20T20:16:43Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr