Line profile asymmetries in chromospherically active stars

Details Line profile asymmetries in chromospherically active stars Line profile asymmetries in chromospherically active stars

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392..187d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. 187-200.

Astronomy and Astrophysics

Astrophysics

40

Chromosphere, Cross Correlation, Light Curve, Spectral Line Width, Stellar Activity, Stellar Spectra, Charge Coupled Devices, Doppler Effect, Stellar Spectrophotometry

Scientific paper

A powerful, new probe of chromospheric activity, cross-correlation, has been developed and applied to a variety of stars. In this particular application, an entire CCD spectrum of an active star is correlated with the spectrum of a narrow-line, inactive star of similar spectral type and luminosity class. Using a number of strong lines in this manner enables the detection of absorption profile asymmetries at moderate resolution (lambda/Delta lambda about 40,000) and S/N 150:1. This technique has been applied to 14 systems mostly RS CVn's, with 10 not greater than nu sin i not greater than 50 km/s and P not less than 7 d. Distortions were detected for the first time in five systems: Sigma Gem, IM Peg, GX Lib, UV Crb, and Zeta And. Detailed modeling, incorporating both spectral line profiles and broad-band photometry, is applied to Sigma Gem. Profile asymmetries for this star are fitted by two high-latitude spots covering 5 percent of the stellar surface. The derived spot temperature of 3400 K is lower than found in previous studies. In addition, two well-known systems have been studied: HD 199178 and V711 Tau. Polar spots are found on both.

Affiliated with

Also associated with

No associations

Rating

Line profile asymmetries in chromospherically active stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Line profile asymmetries in chromospherically active stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Line profile asymmetries in chromospherically active stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1199967