Investigation of micro-flaring and secular and quasi-periodic variations in dMe stars. 8: Phase summation techniques in spectroscopy of GL 735

Details Investigation of micro-flaring and secular and quasi-periodic variations in dMe stars. 8: Phase summation techniques in spectroscopy of GL 735 Investigation of micro-flaring and secular and quasi-periodic variations in dMe stars. 8: Phase summation techniques in spectroscopy of GL 735

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...279..197a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 279, no. 1, p. 197-205

Astronomy and Astrophysics

Astrophysics

1

Absorption Spectra, Emission Spectra, Flare Stars, Line Spectra, Periodic Variations, Red Dwarf Stars, Stellar Atmospheres, Stellar Coronas, Calcium, Phase Shift, Potassium, Spectral Signatures, Stellar Spectrophotometry

Scientific paper

Using spectral signatures possibly associated with quasi-periodic variations in red dwarfs, we investigate the dM3.5e star, Gliese 735, from simultaneous spectral observations during suspected 1.1 minute oscillations in the U-band photometry. Although the spectral signal/noise ratio is poor, there is tentative evidence that the emission fluxes in the CA II K line vary in accordance with the photometric U-band quasi-period. Signature variations are investigated at mean minimum, rising branch, maximum and falling branch of the light curve, using a phase summation (PS) technique. Apart from CaII K, our investigations include hydrogen gamma and hydrogen delta emission, a 'continuum' flux, FC at 4178 - 4192A, the Ca I (4227 A) absorption, the Cr/Fe/Ti absorptions (4249 - 4297 A), a strong Mn absorption (4025 - 4040 A, including He I 4030 A), and the flux at the Fraunhofer L 'absorption' (3810 - 3830 A). We also examine our signatures sequentially across an unresolved 2-second spike flare, but our spectroscopic time resolution was insufficient to detect it. However, it was found that the spike occurred during the maximum in our 1.1 -minute variation. Interpretation of quasi-periodicities as due to possible terrestrial atmospheric effects cannot yet be ruled out.

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