Stellar chromospheres - H-alpha and CA II K profiles

Zarro, D. M.; Rodgers, A. W.

doi:10.1086/190911

Cited by 36 publications

(31 citation statements)

References 58 publications

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“…We observed CG Cyg around the H α line because it is a spectroscopic indicator of chromospheric activity (Zarro & Rogers 1983;Herbig 1985;Frasca & Catalano 1994;Fernandez-Figueroa et al 1994;Strassmeier et al 1990). Figure 2 shows the apparent difference in the spectra of CG Cyg from our two runs; below we describe their characteristics in detail.…”

Section: Orbital Variability Of the Spectral Linesmentioning

confidence: 98%

Spectroscopic and photometric observations of the short-period RS CVn-type star CG Cyg

Kjurkchieva

Marchev

Ogłoza

2003

A&A

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Abstract. Spectroscopic observations around the H α line and BVR photometry of the eclipsing short-period RS CVn-star CG Cyg are presented. The solutions of the radial velocity curves and the light curves yielded the following masses and radii of the star components:The measured rotational broadenings of the observed lines correspond to equatorial velocities V 1 = 80 km s −1 and V 2 = 66 km s −1 . The distortions of our multicolor light curve were reproduced by two cool spots on the primary star. The strong absorption feature between the spectral lines of the two stars was explained by extended structure around the mass center of the system. The H α emission line of the secondary star in the August spectra was attributed to a prolonged flare of this star.

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Section: Orbital Variability Of the Spectral Linesmentioning

confidence: 98%

Spectroscopic and photometric observations of the short-period RS CVn-type star CG Cyg

Kjurkchieva

Marchev

Ogłoza

2003

A&A

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“…Many authors (e.g. Zarro & Rodgers (1983), Young et al (1989), Soderblom et al (1993a), Montes et al (2004), Waite et al (2005)) determine the emission component of the Ha line by subtracting the stellar spectrum from a radial velocity-corrected, inactive star that has been rotationally broadened to match the v sin i of the target. This technique is temperature dependent, but since all of our targets have similar spectral types, a solar spectrum was used as the inactive standard star in this survey.…”

Section: Magnesium-i Triplet and Sodium-i Doubletmentioning

confidence: 99%

High-resolution Spectroscopy and Spectropolarimetry of Some Late F- / Early G-type Sun-like Stars as Targets for Zeeman Doppler Imaging

Waite

Marsden

Carter

et al. 2011

Publ. – Astron. Soc. Aust

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High-resolution spectroscopy and spectropolarimetry have been undertaken at the AngloAustralian Telescope in order to identify suitable targets for magnetic studies of young Sun-like stars, for the proxy study of early solar evolution. This study involved the investigation of some variable late F-/ early G-type Sun-like stars originally identified by the Hipparcos mission. Of the 38 stars observed for this study, HIP 31021, HIP 64732, HIP 73780 were found to be spectroscopic binary stars, while HIP 19072, HIP 67651 and HIP 75636 are also likely to be binaries and HIP 33111 could even be a triple system. Magnetic fields were detected on a number of the survey stars: HIP 21632, HIP 43720, HIP 48770, HIP 62517, HIP 71933, HIP 77144, HIP 89829, HIP 90899 and HIP 105388, making these stars good candidates for follow-up Zeeman Doppler imaging studies.

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“…The analysis of the orbital variability of the spectra yields information about the dominant sources of the spectral lines as well as about the locations of the active regions in binary systems. We observed BH Vir spectroscopically around the H α line because it is a spectroscopic indicator of chromospheric activity (Zarro & Rogers 1983;Herbig 1985;Frasca & Catalano 1994;Strassmeier et al 1990). The H α emission excess in the active stars may appear as a H α line above the continuum or as a weak absorption line with filled-in core.…”

Section: Spectral Appearances (Signs)mentioning

confidence: 99%

Spectroscopic and photometric observations of the short-period RS CVn-type star BH Virginis

Kjurkchieva

Marchev

Heckert

et al. 2004

A&A

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Abstract. High-resolution spectroscopic observations around the H α line and BVRI photometry from 1993 to 2003 of the eclipsing short-period RS CVn star BH Vir are presented. The simultaneous solution of our radial velocity curves and light curves yielded the following values for global parameters of the components:The measured rotational broadening of the spectral lines corresponds to equatorial velocities V 1 = 79.8 km s −1 and V 2 = 68.4 km s −1 . Our data reveal considerable H α emission excess of the two stellar components. We modelled the photometric data to find the size and location of the starspots for each year. The established decreasing trend of the spot latitudes may indicate a latitudinal cycle of at least a decade.

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Stellar chromospheres - H-alpha and CA II K profiles

Cited by 36 publications

References 58 publications

Spectroscopic and photometric observations of the short-period RS CVn-type star CG Cyg

Spectroscopic and photometric observations of the short-period RS CVn-type star CG Cyg

High-resolution Spectroscopy and Spectropolarimetry of Some Late F- / Early G-type Sun-like Stars as Targets for Zeeman Doppler Imaging

Spectroscopic and photometric observations of the short-period RS CVn-type star BH Virginis

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