WR 134: Difference between revisions

WR 134
	;
Observation data; Epoch 2000 Equinox 2000
Constellation	Cygnus
Right ascension	20h 11m 14.193s
Declination	36° 10′ 35.07″
Apparent magnitude (V)	8.02
Characteristics
Evolutionary stage	Wolf-Rayet
Spectral type	WN6-s
U−B color index	-0.63
B−V color index	0.20
Variable type	Algol
Astrometry
Proper motion (μ)	RA: -4.66 mas/yr ; Dec.: -8.59 mas/yr
Parallax (π)	0.04 ± 0.68 mas
Distance	1,740 pc
Absolute magnitude (MV)	-5.07
Details
Mass	19 M☉
Radius	5.29 R☉
Luminosity	400,000 L☉
Temperature	63,100 K
Other designations
	V1769 Cygni, HD 191765, WR 134, HIP 99377, SAO 69541
Database references
SIMBAD	data

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Revision as of 22:01, 16 February 2014

WR 134 is a variable Wolf-Rayet star located around 6,000 light years away from Earth in the constellation of Cygnus, surrounded by a faint bubble nebula blown by the intense radiation and fast wind from the star.

WR 134 is classified as an Algol type eclipsing variable and given the designation V1769 Cygni,^[3] but the variation is not strictly periodic and brightness changes occur on timescales of hours to days. It has been investigated several times to search for companions. Morel reported a 2.25 day primary period but considered the variations to be due to rotational modulation rather than the effects of a companion.^[4] Rustamov suggests a 1.887 day orbital period with a K-M dwarf companion, but with additional optical variations.^[5]

Both hard and soft X-rays have been detected from WR 134 but the sources are not fully explained. The emissions do not match a single star of the expected temperature, are not sufficient for colliding winds between two hot stars, and any compact source such as a neutron star or cool dwarf would be in an unlikely orbit.^[6]

References

^ ^a ^b ^c ^d ^e ^f Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1051/0004-6361:20065052, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1051/0004-6361:20065052 instead.
^ Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1016/S1387-6473(00)00112-3, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1016/S1387-6473(00)00112-3 instead.
^ Bibcode:1971GCVS3.C......0K
^ Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1086/307250, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1086/307250 instead.
^ Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1134/S1063772912100058, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1134/S1063772912100058 instead.
^ Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1088/0004-6256/139/3/825, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1088/0004-6256/139/3/825 instead.

External links

http://apod.nasa.gov/apod/ap120621.html

This star-related article is a stub. You can help Wikipedia by expanding it.

[hamann-1] ^ ^a ^b ^c ^d ^e ^f Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1051/0004-6361:20065052, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1051/0004-6361:20065052 instead.

[hicht-2] Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1016/S1387-6473(00)00112-3, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1016/S1387-6473(00)00112-3 instead.

[gcvs-3] Bibcode:1971GCVS3.C......0K

[morel-4] Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1086/307250, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1086/307250 instead.

[rustamov-5] Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1134/S1063772912100058, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1134/S1063772912100058 instead.

[skinner-6] Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1088/0004-6256/139/3/825, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1088/0004-6256/139/3/825 instead.

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@@ Line 25: / Line 25: @@
 |parallax=0.04
 |p_error=0.68
-|dist_pc=1,740<ref name=skinner>{{cite doi|10.1088/0004-6256/139/3/825}}</ref>
+|dist_pc=1,740<ref name=hicht>{{cite doi|10.1016/S1387-6473(00)00112-3}}</ref>
 |absmag_v=-5.07<ref name=hamann/>
 }}
@@ Line 34: / Line 34: @@
 |temperature=63,100<ref name=hamann/>
 |metal=
-|rotation=1,700<ref name=hamann/>
+|rotation=
 |age=
 }}
 {{Starbox catalog
-|names=[[HD]]&nbsp;191765, WR&nbsp;134, [[HIP]]&nbsp;99377, [[SAO]]&nbsp;69541
+|names=V1769&nbsp;Cygni, [[HD]]&nbsp;191765, WR&nbsp;134, [[HIP]]&nbsp;99377, [[SAO]]&nbsp;69541
-}}
-{{Starbox reference ||Simbad=V1769+Cyg
 }}
+{{Starbox reference ||Simbad=V1769+Cyg}}
 {{Starbox end}}
-'''WR 134''' is a Wolf-Rayet [[variable star]] located around 6,000 light years away from [[Earth]] in the constellation of [[Cygnus (constellation)|Cygnus]], surrounded by a faint bubble nebula blown by the intense radiation and fast wind from the star.
+'''WR 134''' is a [[variable star|variable]] [[Wolf-Rayet star]] located around 6,000 light years away from [[Earth]] in the constellation of [[Cygnus (constellation)|Cygnus]], surrounded by a faint bubble nebula blown by the intense radiation and fast wind from the star.
+WR 134 is classified as an Algol type eclipsing variable and given the designation V1769 Cygni,<ref name=gcvs>{{bibcode|1971GCVS3.C......0K}}</ref> but the variation is not strictly periodic and brightness changes occur on timescales of hours to days.  It has been investigated several times to search for companions.  Morel reported a 2.25 day primary period but considered the variations to be due to rotational modulation rather than the effects of a companion.<ref name=morel>{{cite doi|10.1086/307250}}</ref>  Rustamov suggests a 1.887 day orbital period with a K-M dwarf companion, but with additional optical variations.<ref name=rustamov>{{cite doi|10.1134/S1063772912100058}}</ref>
+Both hard and soft X-rays have been detected from WR 134 but the sources are not fully explained.  The emissions do not match a single star of the expected temperature, are not sufficient for colliding winds between two hot stars, and any compact source such as a neutron star or cool dwarf would be in an unlikely orbit.<ref name=skinner>{{cite doi|10.1088/0004-6256/139/3/825}}</ref>
-WR 134 was observed between 1992 and 1995<ref>{{cite doi|10.1086/307250}}</ref> and was also observed at [[North Tusi Shamakha Observatory]] between 2006 and 2010.<ref>{{cite journal|url=http://link.springer.com/article/10.1134%2FS1063772912100058#page-1|author=D.N. Rustamov and A.M. Cherepashchuk|title= Spectral and Photometric Studies of the Wolf-Rayet Star|publisher=[[National Academy of Sciences of Azerbaijan]]|work=[[ North Tusi Shamakha Astrophysical Observatory]], [[Moscow State University|Lomonosov State University]] and [[Sternberg Astronomical Institute]]|place=[[Moscow]], [[Russia]] and [[Shamakhi District|Shamakha]], [[Azerbaijan]]|date=April 13, 2012}}</ref>  It is classified as an Algol type eclipsing variable and given the designation V1769 Cygni, but the variation is not strictly periodic.  Thus paper suggests a 1.887 day orbital period with a K-M dwarf companion, but with additional optical variations.  Morel<ref name=morel>{{cite doi|10.1086/307250}}</ref> reported a 2.25 day variation with an unidentified compact companion.
 ==References==