Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.7426d&link_type=abstract
American Astronomical Society Meeting 207, #74.26; Bulletin of the American Astronomical Society, Vol. 37, p.1288
Astronomy and Astrophysics
Astronomy
Scientific paper
Empirical measurements of basic stellar and substellar properties in pre-main sequence (PMS) objects are critical to our understanding of how and when these objects evolve toward the main sequence. Dynamical measurements of PMS binary systems are beginning to provide these fundamental data, if they can be accurately placed on an H-R diagram for comparison with PMS evolutionary models. A recent high-precision near-IR radial velocity survey with Phoenix at Gemini South has lead to the new discovery of one double-line spectroscopic binary in Chamaeleon. With the high spectral resolution (R=50,000) provided by Phoenix we have successfully measured the orbital period and determined the dynamical mass ratio (from the relative velocity amplitudes) with our spectra taken over nine epochs (29 April - 23 June, 2005). In two epochs where we have near maximum velocity separation at the 2-0 CO bandhead, we use spectral synthesis templates to fit the primary and secondary bandheads (both evident in the spectrum) to accurately determine the component spectral types. Our multicomponent spectral fits also set constraints on gravity, assumed to be equal for both components in this low mass ( M2) co-evol PMS binary system. With the placement of this system in the H-R diagram by the properties we determine from spectroscopy, we will test the accuracy of theoretical model tracks using the independent mass information obtained from the orbital motion.
Charbonneau David
Doppmann Greg
White Russel
No associations
LandOfFree
A Pre-Main Sequence Spectroscopic Binary Revealed through Infrared Spectroscopy with Phoenix on Gemini. 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 A Pre-Main Sequence Spectroscopic Binary Revealed through Infrared Spectroscopy with Phoenix on Gemini., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Pre-Main Sequence Spectroscopic Binary Revealed through Infrared Spectroscopy with Phoenix on Gemini. will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1281640