Study of the Variable F-Type Supergiants HD161796 and HD163506 in Radial Velocity and Photometry

Details Study of the Variable F-Type Supergiants HD161796 and HD163506 in Radial Velocity and Photometry Study of the Variable F-Type Supergiants HD161796 and HD163506 in Radial Velocity and Photometry

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26as...42..383b&link_type=abstract

Astronomy and Astrophysics Supplement, Vol. 42, P. 383, 1980

Astronomy and Astrophysics

Astrophysics

34

Scientific paper

An observational study in radial velocity (CORAVEL) and Geneva photometry is presented for two F-type supergiants located at high galactic latitude, HD 161796 and HD 163506 (HR 6685, 89 Her, V441 Her).
HD 161796 is discovered to be variable in light and radial velocity. The variations are quite normal for a supergiant star, i.e. they can be described as a pseudo-periodic phenomenon, with a characteristic time of 54 d. The variability of HD 163506 is more complex. On the one hand relatively regular cycles of variation of period between 50 and 75 d were observed in light and radial velocity. But quasi-erratic variations are also observed in radial velocity when simultaneous light variations are quite smooth.
The correlation function given by the spectrophotometer CO RAVEL reveals that in both supergiants a large number of photospheric lines from neutral metals have a-P Cygni profile. This new fact gives photospheric evidence of mass loss from these two supergiants. One of these stars (HD 163506) is known for exhibiting variable P Cygni profiles of the lines, with a terminal velocity of 150-200 km!s (Sargent and Osmer, 1969).
A discussion of the luminosity of these two supergiants is presented. It is concluded that these FIa-type stars are probably not "normal", massive, supergiants of population I.

Affiliated with

Also associated with

No associations

Rating

Study of the Variable F-Type Supergiants HD161796 and HD163506 in Radial Velocity and Photometry 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 Study of the Variable F-Type Supergiants HD161796 and HD163506 in Radial Velocity and Photometry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Study of the Variable F-Type Supergiants HD161796 and HD163506 in Radial Velocity and Photometry will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-753476