Abstract
view Abstract Citations (161) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Infrared Excess of G29--38: A Brown Dwarf or Dust? Graham, James R. ; Matthews, K. ; Neugebauer, G. ; Soifer, B. T. Abstract The white dwarf star G29-38 has an infrared excess which may be due to a cool low-mass companion, probably a brown dwarf, or to circumstellar dust. If the excess is due to dust, then changes in luminosity of the white dwarf, which is a ZZ Ceti variable, may cause the infrared excess to vary in phase with the optical pulsations. Simultaneous optical and infrared light curves of G29-38 have been obtained to search for variability of the excess. The known 614 s period of G29-39 is seen at B and J, with amplitudes and phases which are in excellent agreement with the predictions of adiabatic, g-mode pulsation theory. No variability with a 614 s period is found at K above that expected from the white dwarf photosphere. Two significant periodicities are discovered in the K light curve at 181 + or - 10 s and 243 + or - 15 s. These periods are not found at shorter wavelengths, and it is concluded that they must be due to variations in the strength of the infrared excess, rather than the photospheric emission from the white dwarf. A model is proposed which invokes a dust ring around the white dwarf to explain the infrared excess and variability in this system. Publication: The Astrophysical Journal Pub Date: July 1990 DOI: 10.1086/168907 Bibcode: 1990ApJ...357..216G Keywords: Brown Dwarf Stars; Cosmic Dust; Infrared Sources (Astronomy); Stellar Envelopes; White Dwarf Stars; Companion Stars; Cool Stars; Stellar Mass; Stellar Oscillations; Astrophysics; INFRARED: SOURCES; STARS: CIRCUMSTELLAR SHELLS; STARS: INDIVIDUAL ALPHANUMERIC: G29-38; STARS: PULSATION; STARS: WHITE DWARFS full text sources ADS | data products SIMBAD (4)
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
