The Eccentric-Orbit Eclipsing Double-Lined System HP Draconis

Details The Eccentric-Orbit Eclipsing Double-Lined System HP Draconis The Eccentric-Orbit Eclipsing Double-Lined System HP Draconis

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21333005m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #330.05; Bulletin of the American Astronomical Society, Vol. 41, p.387

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

The 10.76-d period EA system HP Dra was discovered through the HIPPARCOS mission (albeit with an incorrect period). Radial velocities from the Asiago and Haute Provence Observatories (HPO), and light curve data from Cracow Observatory (CO) and HIPPARCOS have been analyzed now with the most recent version of the Wilson-Devinney program. The Cracow photometry covers both eclipses completely, unlike the HIPPARCOS data in which only 3 and 7 points fall within the primary and secondary minima, respectively. Initial and unadjusted values came from our separate preliminary analyses. Color and spectral type suggest 6000 K as the temperature of Star 1, the hotter component. The analysis involved the simultaneous adjustment of 13 non-curve dependent parameters and 2 curve-dependent parameters, 19 parameters in total.
The adjusted parameters were the semi-major axis, eccentricity, and its derivative, argument of periastron and its derivative, systemic radial velocity, secondary temperature, modified Kopal potentials of both components, period and its derivative, epoch, mass ratio (M2/M1), passband luminosity, and third light. From this analysis, there is no significant period variation, but a marginally significant apsidal motion and significant third light in each of the B, V, and hp passbands. This solution indicates that components 1 and 2 have masses of 1.15 and 1.11 Msun, radii of 1.38 and 1.06 Rsun, and have absolute bolometric magnitudes of 3.93 and 4.59, respectively. Work is continuing to verify the apsidal motion and to characterize better the 3rd light in the system, through new visual and infrared observations.
This work was supported in part by grants from Canadian NSERC to EFM, and data acquisition at the HPO and CO was partly funded by the
European program "Actions Integrees" POLONIUM and carried out within the framework of the European Associated Laboratory "Astrophysics Poland-France."

Affiliated with

Also associated with

No associations

Rating

The Eccentric-Orbit Eclipsing Double-Lined System HP Draconis 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 The Eccentric-Orbit Eclipsing Double-Lined System HP Draconis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Eccentric-Orbit Eclipsing Double-Lined System HP Draconis will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1698760