Speaker
Dr
Soumen Mondal
(S. N. Bose National Centre for Basic Sciences)
Description
A sample of young M-dwarfs from young moving groups and old population from the galactic field is observed using the near-infrared TIRSPEC instrument (R=1200) on the 2-m Himalayan Chandra Telescope (HCT) at Hanle. Using interferometrically measured effective temperatures, radii, luminosities of a sample of calibrators with spectral type ranging from M0 V to M6 V, we have developed modified empirical calibration relations based on HK-band TIRSPEC spectra. The standard deviations in the residuals of our best fits for Teff and radii are 100 K and 0.03 Rsun, respectively. The metallicities [Fe/H] and [M/H] of M-dwarfs are estimated from Na I, Ca I equivalent widths and H2O - K2 index. The characterization of M-dwarfs is important to future exoplanet missions targeting for potential habitable exoplanet host stars.
Primary author
Mr
Dhrimadri Khata
(S. N. Bose National Centre for Basic Sciences)
Co-authors
Dr
Ramkrishna Das
(S. N. Bose National Centre for Basic Sciences)
Dr
Soumen Mondal
(S. N. Bose National Centre for Basic Sciences)
Mr
Supriyo Ghosh
(S. N. Bose National Centre for Basic Sciences)
