About: GCIRS 16SW

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GCIRS 16SW, also known as S97, is a contact binary star located in the Galactic Center. It is composed of two hot massive stars of equal size that orbit each other with a period of 19.5 days. The stars are so close that their atmospheres overlap, and the two stars form an eclipsing binary varying in brightness by 0.35 magnitudes at infrared wavelengths. GCIRS 16SW was classified as a candidate luminous blue variable on the basis of its spectrum and physical properties. This was before it was identified as an eclipsing binary, but it is still treated as a candidate LBV.

Attributes	Values
rdf:type	Thing place dbo:Location schema:Place celestial body star
rdfs:label	GCIRS 16SW (en)
rdfs:comment	GCIRS 16SW, also known as S97, is a contact binary star located in the Galactic Center. It is composed of two hot massive stars of equal size that orbit each other with a period of 19.5 days. The stars are so close that their atmospheres overlap, and the two stars form an eclipsing binary varying in brightness by 0.35 magnitudes at infrared wavelengths. GCIRS 16SW was classified as a candidate luminous blue variable on the basis of its spectrum and physical properties. This was before it was identified as an eclipsing binary, but it is still treated as a candidate LBV. (en)
foaf:name	(en) GCIRS 16SW (en)
name	GCIRS 16SW (en)
foaf:depiction
dct:subject	Eclipsing binaries Sagittarius (constellation) Wolf–Rayet stars
Wikipage page ID	64435458 (xsd:integer)
Wikipage revision ID	1120656463 (xsd:integer)
Link from a Wikipage to another Wikipage	Infrared Eclipsing binaries Sagittarius (constellation) Sagittarius (constellation) Sagittarius A* Effective temperature Contact binary Galactic Center International Celestial Reference System J2000.0 Astronomical unit Wolf–Rayet stars Eclipsing binary Eddington luminosity Solar mass Wolf–Rayet star Luminous blue variable
sameAs	GCIRS 16SW GCIRS 16SW
dbp:wikiPageUsesTemplate	dbt:Convert dbt:Reflist dbt:Short_description dbt:Solar_radius dbt:Starbox_begin dbt:Starbox_catalog dbt:Starbox_character dbt:Starbox_detail dbt:Starbox_end dbt:Starbox_image dbt:Starbox_observe dbt:Starbox_orbit dbt:Starbox_reference dbt:Stars_of_Sagittarius dbt:Val dbt:DEC dbt:Location_mark dbt:RA
thumbnail	wiki-commons:Special:FilePath/GCIRS16SWLocation.png?width=300
appmag 1 passband	J (en)
appmag 2 passband	H (en)
appmag 3 passband	K (en)
class	Ofpe/WN9 (en)
component	A (en) B (en)
constell	Sagittarius (constellation)
epoch	J2000.0
equinox	J2000.0 (en)
gravity	3 (xsd:integer)
luminosity	1100000 (xsd:integer)
mass	~50 (en)
primary	Sagittarius A*
radius	× × (en)
temperature	23500 (xsd:integer) 24400 (xsd:integer)
type	Wolf–Rayet star
has abstract	GCIRS 16SW, also known as S97, is a contact binary star located in the Galactic Center. It is composed of two hot massive stars of equal size that orbit each other with a period of 19.5 days. The stars are so close that their atmospheres overlap, and the two stars form an eclipsing binary varying in brightness by 0.35 magnitudes at infrared wavelengths. GCIRS 16SW orbits Sagittarius A* at approximately 19,000 AU, with a period of approximately 1,270 years. At the stars' estimated mass of about 50 solar masses, they are predicted to have a lifespan of about 4 million years, indicating that the system formed within 0.1 parsecs (0.33 ly; 21,000 AU) of Sagittarius A*, instead of having migrated inward from a greater distance. GCIRS 16SW was classified as a candidate luminous blue variable on the basis of its spectrum and physical properties. This was before it was identified as an eclipsing binary, but it is still treated as a candidate LBV. Each star is strongly distorted by the gravity of the other star. The polar radius is calculated to be 54.5 R☉, while the radius along the direction of orbital motion is 58.2 R☉. The radius along the line joining the two stars is 62.7 R☉, while the separation of the centres of the two stars is 132.8 R☉. A calculation of properties treating the binary as a single star gave an effective temperature of 24,400 K. The secondary component is found to have a temperature 96% of that of the primary. However, these temperatures yield a luminosity over a million times that of the sun, uncomfortably close to the Eddington luminosity for each star, and it is suspected the actual temperatures are slightly lower. (en)
prov:wasDerivedFrom	wikipedia-en:GCIRS_16SW?oldid=1120656463&ns=0
page length (characters) of wiki page	8008 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:GCIRS_16SW
is Link from a Wikipage to another Wikipage of	List of most luminous stars S97 (star) Luminous blue variable Sagittarius A* cluster S97
is Wikipage redirect of	S97 (star)
is foaf:primaryTopic of	wikipedia-en:GCIRS_16SW

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