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Accurate Masses for the Primary and Secondary in the Eclipsing White Dwarf Binary NLTT 11748

Mukremin Kilic; Carlos Allende Prieto; Warren R. Brown; Marcel Andre Agüeros; S. J. Kenyon; Fernando Camilo; Nicole M. Silvestri

Title:
Accurate Masses for the Primary and Secondary in the Eclipsing White Dwarf Binary NLTT 11748
Author(s):
Kilic, Mukremin
Allende Prieto, Carlos
Brown, Warren R.
Agüeros, Marcel Andre
Kenyon, S. J.
Camilo, Fernando
Silvestri, Nicole M.
Date:
Type:
Articles
Department(s):
Astronomy
Volume:
721
Persistent URL:
Book/Journal Title:
Astrophysical Journal Letters
Publisher:
IOP Science
Abstract:
We measure the radial velocity curve of the eclipsing detached white dwarf binary NLTT 11748. The primary exhibits velocity variations with a semi-amplitude of 273 km s⁻¹ and an orbital period of 5.641 hr. We do not detect any spectral features from the secondary star or any spectral changes during the secondary eclipse. We use our composite spectrum to constrain the temperature and surface gravity of the primary to be T_eff = 8690 ± 140 K and log g = 6.54 ± 0.05, which correspond to a mass of 0.18 M ☉. For an inclination angle of 89.°9 derived from the eclipse modeling, the mass function requires a 0.76 M ☉ companion. The merger time for the system is 7.2 Gyr. However, due to the extreme mass ratio of 0.24, the binary will most likely create an AM CVn system instead of a merger.
Subject(s):
Astrophysics
White dwarf stars
Binary stars
Eclipsing binaries
Double stars--Orbits
Astronomy
Publisher DOI:
https://doi.org/10.1088/2041-8205/721/2/L158
Item views
241
Metadata:
text | xml
Suggested Citation:
Mukremin Kilic, Carlos Allende Prieto, Warren R. Brown, Marcel Andre Agüeros, S. J. Kenyon, Fernando Camilo, Nicole M. Silvestri, , Accurate Masses for the Primary and Secondary in the Eclipsing White Dwarf Binary NLTT 11748, Columbia University Academic Commons, .

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