The FU Orionis outburst as a thermal accretion event: Observational constraints for protostellar disk models

التفاصيل البيبلوغرافية
العنوان: The FU Orionis outburst as a thermal accretion event: Observational constraints for protostellar disk models
المؤلفون: D. N. C. Lin, S. J. Kenyon, K. R. Bell, Lee Hartmann
المصدر: The Astrophysical Journal. 444:376
بيانات النشر: American Astronomical Society, 1995.
سنة النشر: 1995
مصطلحات موضوعية: Mass flux, Physics, Astrophysics::High Energy Astrophysical Phenomena, Astronomy, Perturbation (astronomy), Astronomy and Astrophysics, Angular velocity, Astrophysics, Light curve, Lambda, Space and Planetary Science, Astrophysics::Solar and Stellar Astrophysics, Spectral energy distribution, Astrophysics::Earth and Planetary Astrophysics, Variable star, Stellar evolution
الوصف: The results of the time-dependent disk models developed in Bell & Lin are compared with observed properties of FU Orionis variables. Specific models are fit to the light curves of Fu Ori, V1515 Cyg, and V1057 Cyg. The slow risetime of V1515 Cyg can be matched by a self-regulated outburst model. The rapid risetimes of FU Ori and V1057 Cyg can be fitted with the application of modest perturbations to the disk surface density. Model disks display spectral features characteristic of observed objects. The color evolution of V1057 Cyg is naturally explained if mass flux drops in the inner disk (r less than 1/4 AU) while remaining steady in the outer disk. The decrease in optical line width (rotational velocity) observed during the decay of V1057 Cyg may be accounted for by an outward-propagating ionization front. We predict that before final decay to the quiescent phase, short-wavelength line widths (lambda less than 1.5 microns) will again increase. It is suggested that FU Orionis outbursts primarily occur to systems during the embedded phase with ages less than several times 10(exp 5) yr.
تدمد: 1538-4357
0004-637X
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::354dc2293763b32dbd225d6167bcd84f
https://doi.org/10.1086/175612
حقوق: OPEN
رقم الأكسشن: edsair.doi...........354dc2293763b32dbd225d6167bcd84f
قاعدة البيانات: OpenAIRE