Starspots found on the ellipsoidal variable V350 lacertae = HR 8575

Details Starspots found on the ellipsoidal variable V350 lacertae = HR 8575 Starspots found on the ellipsoidal variable V350 lacertae = HR 8575

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.1346c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 109, no. 3, p. 1346-1351

Other

6

Binary Stars, Light Curve, Orbital Elements, Radial Velocity, Starspots, Stellar Orbits, Stellar Rotation, Variable Stars, Amplitudes, Angular Velocity, Brightness, Data Correlation, Ellipticity, Stellar Spectrophotometry

Scientific paper

It has been a puzzle why this chromospherically active, strong-dynamo K2 IV-III star is not known to have the large starspots characteristic of other such stars. Published individual radial velocities, which had never been analyzed, are used to derive an orbital solution. Combined with the one older existing orbital solution, this yields an improved orbital ephemeris: time of conjunction (K star behind) = JD 2445255.47 +/- 0.11 days and period = 17.75346 +/- 0.00016 days. All available photoelectric photometry, from 1970.9 to 1992.5, is collected A cos 2 theta fit of the ellipticity effect yields JD 2445255.60 +/- 0.06 days for a time of conjunction, 17.7523 +/- 0.0005 days for the period, and 0.084 mins for the peak-to-peak amplitude in V. With the ellipticity effect removed, the light curve does show measurable starspot variability in 15 of 16 data groups, the starspot wave amplitudes ranging between 0.03 mins and 0.08 mins. Ten starspots are identified and their rotation periods determined, the mean being 17.70 +/- 0.03 days (confirming synchronous rotation) and the range being Delta P/P = 0.017 +/- 0.006 (indicating differential rotation). There is a slow variation in mean brightness, almost 0.1 min in range and at least 2 decades in length.

Affiliated with

Also associated with

No associations

Rating

Starspots found on the ellipsoidal variable V350 lacertae = HR 8575 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 Starspots found on the ellipsoidal variable V350 lacertae = HR 8575, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Starspots found on the ellipsoidal variable V350 lacertae = HR 8575 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-883984