Y Lyncis

{{Starbox begin

| name=Y Lyncis }}

{{Starbox image

| image = 250px

| caption = A visual band light curve for Y Lyncis, adapted from Percy et al. (2001). The top panel shows the brightness variation over a period of several years, and the lower panel shows shorter time scale variations.

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|07|28|11.61657}}

| dec = {{DEC|+45|59|26.2295}}

| appmag_v = 6.2 - 8.9

| constell = Lynx

}}

{{Starbox character

| type = AGB

| class = M6S Ib

| b-v =

| u-b =

| variable = SRc

}}

{{Starbox astrometry

| radial_v = {{val|5.50|0.6}}

| prop_mo_ra = −1.278

| prop_mo_dec = −4.067

| parallax = 2.8068

| p_error = 0.1138

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| mass = 1.5 - 2.0

| radius = 580

| luminosity = 10,765

| gravity = 0.0

| temperature = 3,200

| metal_fe = −0.19

| rotational_velocity =

| age =

}}

{{Starbox catalog

| names = Y Lyn, HD 58521, BD+46°1271, HIP 36288, SAO 41784

}}

{{Starbox reference

| Simbad = Y+Lyn

}}

Y Lyncis is a semiregular variable star in the constellation Lynx. It is an asymptotic giant branch star of spectral type M6S, with a luminosity class of Ib, indicating a supergiant luminosity. It is around 1,160 light years away. Y Lyncis ranges in brightness from magnitude 6.2 to 8.9. When it is at its brightest, it very faintly visible to the naked eye under excellent observing conditions.

In 1901 it was announced that Williamina Fleming had discovered that the star, then known as BD +46°1271, is a variable star. It was given its variable star designation, Y Lyncis, in 1912. The changes in brightness of this star are complex, with at least two different periods showing. The General Catalogue of Variable Stars lists a period of 110 days. More recent studies show a primary pulsation period of 133 days, with and a long secondary period with an amplitude of 0.2 magnitudes and duration 1,300 days. The long secondary period variations are possibly caused by long-lived convection cells.

Y Lyncis has a mass around {{solar mass|1.5-2.0}} and a luminosity around {{solar luminosity|10,000}}. It is a thermally pulsing asymptotic giant branch star, an evolved star with a carbon-oxygen core that is fusing helium in a shell and hydrogen in a separate shell. It is also an S-type star, where third dredge-ups have brought some carbon to the surface, but not enough to create a carbon star.

References

{{reflist|30em|refs=

{{cite journal |last1=Pickering |first1=E. C. |last2=Colson |first2=H. R. |last3=Fleming |first3=W. P. |last4=Wells |first4=L. D. |title=Sixty-four new variable stars |journal=Astrophysical Journal |date=April 1901 |volume=13 |pages=226–230 |doi=10.1086/140808 |bibcode=1901ApJ....13..226P }}

{{cite journal |last1=Percy |first1=John R. |last2=Wilson |first2=Joseph B.. |last3=Henry |first3=Gregory W. |title=Long-Term VRI Photometry of Small-Amplitude Red Variables. I. Light Curves and Periods |journal=Publications of the Astronomical Society of the Pacific |date=August 2001 |volume=113 |issue=786 |pages=983–996 |doi=10.1086/322153 |bibcode=2001PASP..113..983P |s2cid=14609175 |doi-access=free }}

{{cite journal |last1=Dunér |last2=Hartwig |last3=Müller |title=Benennung von neu entdeckten veränderlichen Sternen |journal=Astronomische Nachrichten |date=June 1912 |volume=191 |issue=19 |pages=341–358 |doi=10.1002/asna.19121911902 |bibcode=1912AN....191..341. }}

{{cite journal|doi=10.1051/0004-6361:200809932|title=Infrared photometry and evolution of mass-losing AGB stars|journal=Astronomy and Astrophysics|volume=488|issue=2|pages=675–684|year=2008|last1=Guandalini|first1=R.|last2=Busso|first2=M.|arxiv = 0806.4591 |bibcode = 2008A&A...488..675G |s2cid=14294870}}

{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

{{cite journal|bibcode=2009JRASC.103...11P|title=Long Secondary Periods in Pulsating Red Supergiant Stars|journal=Journal of the Royal Astronomical Society of Canada|volume=103|pages=11|last1=Percy|first1=John R.|last2=Sato|first2=Hiromitsu|year=2009|issue=1}}

{{cite journal | title=Periodicities of the light curve of the semiregular variable star Y Lyncis |author1=Szatmary, Karoly |author2=Vinko, Jozsef |journal=Monthly Notices of the Royal Astronomical Society | volume=256|issue=2| pages=321–28 | year=1992| doi= 10.1093/mnras/256.2.321 | bibcode=1992MNRAS.256..321S|doi-access=free }}

{{cite journal|bibcode= 2016A&A...591A.118S|title= The PASTEL catalogue: 2016 version|journal= Astronomy & Astrophysics|volume= 591|pages= A118|last1= Soubiran|first1= Caroline|last2= Le Campion|first2= Jean-François|last3= Brouillet|first3= Nathalie|last4= Chemin|first4= Laurent|year= 2016|doi= 10.1051/0004-6361/201628497|arxiv = 1605.07384 |s2cid= 119258214}}

{{cite journal|bibcode=2006MNRAS.372.1721K|arxiv=astro-ph/0608438|title=Variability in red supergiant stars: Pulsations, long secondary periods and convection noise|journal=Monthly Notices of the Royal Astronomical Society|volume=372|issue=4|pages=1721–1734|last1=Kiss|first1=L. L.|last2=Szabó|first2=Gy. M.|last3=Bedding|first3=T. R.|year=2006|doi=10.1111/j.1365-2966.2006.10973.x|doi-access=free |s2cid=5203133}}

{{cite journal|bibcode=2008A&A...488..675G|arxiv=0806.4591|title=Infrared photometry and evolution of mass-losing AGB stars. II. Luminosity and colors of MS and S stars|journal=Astronomy and Astrophysics|volume=488|issue=2|pages=675–684|last1=Guandalini|first1=R.|last2=Busso|first2=M.|year=2008|doi=10.1051/0004-6361:200809932|s2cid=14294870}}

{{cite journal | last1 = Gontcharov | first1 = G. A. | title = Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system | journal = Astronomy Letters | date = November 2006 | volume = 32 | issue = 11 | pages = 759–771 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773706110065 | pmid = | bibcode = 2006AstL...32..759G | arxiv = 1606.08053 | s2cid = 119231169 }}

}}

Category:Lynx (constellation)

Category:Semiregular variable stars

036288

058521

Category:S-type stars

Lyncis, Y

Category:Durchmusterung objects