The 1 mm spectrum of VY Canis Majoris: Chemistry in an O-rich envelope
نویسندگان
چکیده
منابع مشابه
VY Canis Majoris: The Astrophysical Basis of Its Luminosity
The luminosity of the famous red supergiant VY CMa ( L ∼ 4− 5× 105L⊙) is well-determined from its spectral energy distribution and distance, and places it near the empirical upper luminosity limit for cool hypergiants. In contrast, its surface temperature is fundamentally ill-defined. Both contradict a recent paper by Massey, Levesque and Plez (2006). Implications for its location on the HR Dia...
متن کاملALMA sub-mm maser and dust distribution of VY Canis Majoris⋆
Aims. Cool, evolved stars have copious, enriched winds. Observations have so far not fully constrained models for the shaping and acceleration of these winds. We need to understand the dynamics better, from the pulsating stellar surface to ∼10 stellar radii, where radiation pressure on dust is fully effective. Asymmetric nebulae around some red supergiants imply the action of additional forces....
متن کاملThe ISO Long Wavelength Spectrometer line spectrum of VY Canis Majoris and other oxygen-rich evolved stars***
Context. The far-infrared spectra of circumstellar envelopes around various oxygen-rich stars were observed using the ISO Long Wavelength Spectrometer (LWS). These have been shown to be spectrally rich, particularly in water lines, indicating a high H2O abundance. Aims. We have examined high signal-to-noise ISO LWS observations of the luminous supergiant star, VY CMa, with the aim of identifyin...
متن کاملMolecular line interferometry of VY Canis Majoris: Probing different regions of its envelope
Early in the history of molecular radio astronomy, very strong maser emission in the 1612 MHz satellite hyperfine structure line of OH was found toward the extremely luminous peculiar red M3/M4II supergiant VY CMa, pinpointing it as a remarkable object. Apart from strong maser emission from the OH, H2O, and SiO molecules thermal emission has been detected toward VY CMa from CO and a number of o...
متن کاملHIFISTARS Herschel/HIFI observations of VY Canis Majoris
Aims. The study of the molecular gas in the circumstellar envelopes of evolved stars is normally undertaken by observing lines of CO (and other species) in the millimetre-wave domain. In general, the excitation requirements of the observed lines are low at these wavelengths, and therefore these observations predominantly probe the cold outer envelope while studying the warm inner regions of the...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2008
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921308021492