White Dwarf and Pre-White Dwarf Pulsations

Montgomery, M. H.

doi:10.1063/1.3246571

AIP Conference Proceedings 2009

DOI: 10.1063/1.3246571

|View full text |Cite

White Dwarf and Pre-White Dwarf Pulsations

M. H. Montgomery¹

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

2011

2012

Publication Types

Select...

Article2

Relationship

Self Cite1

Independent1

Authors

Journals

Cited by 2 publications

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Empirical Determination of Convection Parameters in White Dwarfs. I. Whole Earth Telescope Observations of Ec14012-1446

Provencal

Montgomery

Kanaan

et al. 2012

ApJ

Self Cite

View full text Add to dashboard Cite

We report on analysis of 308.3 hrs of high speed photometry targeting the pulsating DA white dwarf EC14012-1446. The data were acquired with the Whole Earth Telescope (WET) during the 2008 international observing run XCOV26. The Fourier transform of the light curve contains 19 independent frequencies and numerous combination frequencies. The dominant peaks are 1633.907, 1887.404, and 2504.897 µHz. Our analysis of the combination amplitudes reveals that the parent frequencies are consistent with modes of spherical degree l=1. The combination amplitudes also provide m identifications for the largest amplitude parent frequencies. Our seismology analysis, which includes 2004-2007 archival data, confirms these identifications, provides constraints on additional frequencies, and finds an average period spacing of 41 s. Building on this foundation, we present nonlinear fits to high signal-to-noise light curves from the SOAR 4.1m, Mc-Donald 2.1m, and KPNO 2m telescopes. The fits indicate a time-averaged convective response timescale of τ 0 = 99.4 ± 17 s, a temperature exponent N = 85 ± 6.2 and an inclination angle of θ i = 32.9 ± 3.2 • . We present our current empirical map of the convective response timescale across the DA instability strip.

show abstract

Empirical Determination of Convection Parameters in White Dwarfs. I. Whole Earth Telescope Observations of Ec14012-1446

Provencal

Montgomery

Kanaan

et al. 2012

ApJ

Self Cite

View full text Add to dashboard Cite

show abstract

Radial Velocity Confirmation of a Binary Detected From Pulse Timings

Barlow

Dunlap

Clemens

2011

ApJ

View full text Add to dashboard Cite

A periodic variation in the pulse timings of the pulsating hot subdwarf B star CS 1246 was recently discovered via the O-C diagram and suggests the presence of a binary companion with an orbital period of two weeks. Fits to this phase variation, when interpreted as orbital reflex motion, imply CS 1246 orbits a barycenter 11 light-seconds away with a velocity of 16.6 km s −1 . Using the Goodman spectrograph on the SOAR telescope, we decided to confirm this hypothesis by obtaining radial velocity measurements of the system over several months. Our spectra reveal a velocity variation with amplitude, period, and phase in accordance with the O-C diagram predictions. This corroboration demonstrates that the rapid pulsations of hot subdwarf B stars can be adequate clocks for the discovery of binary companions via the pulse timing method.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

hi@scite.ai

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

White Dwarf and Pre-White Dwarf Pulsations

Cited by 2 publications

References 38 publications

Empirical Determination of Convection Parameters in White Dwarfs. I. Whole Earth Telescope Observations of Ec14012-1446

Empirical Determination of Convection Parameters in White Dwarfs. I. Whole Earth Telescope Observations of Ec14012-1446

Radial Velocity Confirmation of a Binary Detected From Pulse Timings

Contact Info

Product

Resources

About