About: RT Virginis

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RT Virginis is a variable star in the equatorial constellation of Virgo, abbreviated RT Vir. It ranges in brightness from an apparent visual magnitude of 7.7 down to 9.7, which is too faint to be visible to the naked eye. Based on parallax measurements made with the VLBI, the distance to this star is approximately 740 light years. It is receding from the Sun with a radial velocity of 17 km/s.

Attributes	Values
rdf:type	Thing place dbo:Location schema:Place celestial body star
rdfs:label	RT Virginis (en)
rdfs:comment	RT Virginis is a variable star in the equatorial constellation of Virgo, abbreviated RT Vir. It ranges in brightness from an apparent visual magnitude of 7.7 down to 9.7, which is too faint to be visible to the naked eye. Based on parallax measurements made with the VLBI, the distance to this star is approximately 740 light years. It is receding from the Sun with a radial velocity of 17 km/s. (en)
foaf:depiction
dcterms:subject	Asymptotic-giant-branch stars Durchmusterung objects Henry Draper Catalogue objects Hipparcos objects Objects with variable star designations Semiregular variable stars Virgo (constellation) Red giants
Wikipage page ID	71716640 (xsd:integer)
Wikipage revision ID	1111862424 (xsd:integer)
Link from a Wikipage to another Wikipage	American Association of Variable Star Observers All Sky Automated Survey Virgo (constellation) Stellar classification Light curve Asymptotic-giant-branch stars Durchmusterung objects Henry Draper Catalogue objects Hipparcos objects Objects with variable star designations Semiregular variable stars Virgo (constellation) Constellation Light year Silicon monoxide Stellar evolution Stellar pulsation Red giants Stellar parallax Very-long-baseline interferometry Williamina Fleming Celestial equator Red giant Asymptotic giant branch Sun Semiregular variable star Solar mass Apparent visual magnitude Emission lines Radial velocity Maser Variable star Photometric system Semiregular variable Alfred H. Joy dbr:Dale_Flint_Dickinson dbr:Pavel_N._Kholopov
sameAs	RT Virginis RT Virginis
dbp:wikiPageUsesTemplate	dbt:Citation dbt:Div_col dbt:Div_col_end dbt:Reflist dbt:Short_description dbt:Starbox_astrometry dbt:Starbox_begin dbt:Starbox_catalog dbt:Starbox_character dbt:Starbox_detail dbt:Starbox_end dbt:Starbox_image dbt:Starbox_observe dbt:Starbox_reference dbt:Stars_of_Virgo dbt:Val dbt:± dbt:DEC dbt:Odlist dbt:RA
thumbnail	wiki-commons:Special:FilePath/RTVirLightCurve.png?width=300
absmag v	2.940000 (xsd:double)
b-v	1.352000 (xsd:double)
class	M8III (en)
constell	Virgo (constellation)
epoch	J2000 (en)
gravity	+0.21 (en)
mass	1.500000 (xsd:double)
metal fe	−0.33 (en)
p error	0.134000 (xsd:double)
parallax	4.417000 (xsd:double)
prop mo dec	−17.714 (en)
prop mo ra	+37.037 (en)
radial v	17.300000 (xsd:double)
radius	390 (xsd:integer)
temperature	2902 (xsd:integer)
type	Asymptotic giant branch
variable	Semiregular variable star
has abstract	RT Virginis is a variable star in the equatorial constellation of Virgo, abbreviated RT Vir. It ranges in brightness from an apparent visual magnitude of 7.7 down to 9.7, which is too faint to be visible to the naked eye. Based on parallax measurements made with the VLBI, the distance to this star is approximately 740 light years. It is receding from the Sun with a radial velocity of 17 km/s. The long period variability of this star was discovered by W. P. Fleming in 1896, based on photographic plates taken between 1886 and 1895. A. H. Joy in 1942 categorized it as an irregular variable with a stellar classification of M8III. In 1969 it was classified as a semiregular variable star of the SRb type. The period was determined to be 155 days by and associates in 1985, then re-evaluated as 375 days based on AAVSO light curves in 1997. This is an oxygen-rich red giant star on the asymptotic giant branch of its evolution, and is undergoing mass loss due to thermal pulsation. Water vapor emission in the vicinity of the star was detected in the microwave band by in 1973. This is originating from strong maser emission in a circumstellar gas-dust shell. The flux density of these water masers is over 100 Jy. The star is losing mass at a rate of 3×10−6 M☉·yr−1; the equivalent of the Sun's mass in 3.3 million years. The velocity of the spherically expanding gas is as high as 11 km/s in the water maser region, at a radius of 5 to 25 AU. In a SiO emitting region located ~400 AU from the star, the gas velocity is 7.8 km/s. This outflow appears clumpy and asymmetrical with a strong temporal variation. (en)
prov:wasDerivedFrom	wikipedia-en:RT_Virginis?oldid=1111862424&ns=0
page length (characters) of wiki page	13848 (xsd:nonNegativeInteger)

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