1998A&A...329..213H -
Astronomy and Astrophysics, volume 329, 213-218 (1998/1-1)
A cold detached dust envelope around an oxygen-rich Mira-type AGB star R Hydrae.
HASHIMOTO O., IZUMIURA H., KESTER D.J.M. and BONTEKOE T.R.
Abstract (from CDS):
The circumstellar structure of R Hydrae has been investigated in the IRAS survey scan data. R Hya is a late M-type Mira variable star whose IRAS LRS spectrum is classified as 15 (no feature). But, it shows a remarkable infrared excess in the IRAS photometric data, which cannot be explained by an oxygen-rich circumstellar dust envelope of a mass losing late-type star without showing a significant 10µm silicate feature in the LRS spectrum. An extended emission component around R Hya is clearly found in the 60 and 100µm images produced by Pyramid Maximum Entropy (PME) image reconstruction techniques. It is also visible in the individual IRAS scan data at 25, 60 and 100µm. It firmly indicates the existence of an extended circumstellar dust envelope around R Hya. The IRAS data further suggest the dust envelope being detached from the central star. The detached circumstellar dust envelope is consistent with both the featureless LRS spectrum and the red colors in the IRAS photometric data. R Hya is likely to be experiencing a cessation of mass loss which has lasted for about one hundred years, and which has made the inner boundary of the dust envelope about sixty stellar radii, far from the region which is warm enough to produce the 10µm feature.
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Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
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References (488 between 1850 and 2024) (Total 488)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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