VizieR Online Data Catalog: Mode identification in 3 pulsating hot subdwarfs (Sahoo+, 2020)

In case of SB 459, the only available quantitative spectral analysis was carried out by Heber et al. (1984A&A...130..119H). Therefore, it was considered worthwhile to revisit the star and to take another spectrum with more advanced instruments than before. The ESO Faint Object Spectrograph and Camera 2 (EFOSC2) spectrograph at the 3.58-m New Technology Telescope (NTT) at the La Silla Observatory was used. The single spectrum was obtained on 2019 June with grism #7, a slit of 1arcsec covering the wavelength range from 3270 to 5240Å.

SB 459 was also observed with Boller & Chivens Spectrograph at the 2.5-m Irene Du Pont Telescope at the Las Campanas Observatory. The single spectrum was taken on 2019 October 31 using the following instrument setup, the grating of 600 lines/mm corresponding to the central wavelength of 5000Å covering a wider wavelength range from 3427 to 6573Å.

PG 0342+026 was observed in 2012 November-December with Harps-N at the Telescopio Nazionale Galileo (TNG, La Palma) in the context of a program to search for sdB low-mass companions (see Silvotti, Ostensen & Telting 2020arXiv200204545S for more details). Four high-resolution spectra were collected with a mean signal-to-noise ratio of 71 at 4700Å.

Photometric measurements allow the angular diameters to be determined along with the interstellar extinction, once the atmospheric parameters are known. We constructed spectral energy distributions from photometric measurements ranging from the ultraviolet (IUE) to the infrared.

(8 data files).