Gliese 49
{{short description|Star in the constellation Cassiopeia}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000.0
| constell = Cassiopeia
| dec = {{DEC|+62|20|42.1728}}
| appmag_v = {{Val|9.56|0.02}}
}}
{{Starbox character
| type =
| u-b =
| variable =
}}
{{Starbox astrometry
| radial_v = {{Val|−5.974|0.0011}}
| parallax = 101.4238
| p_error = 0.0169
| parallax_footnote = {{Cite Gaia EDR3|522863309964987520}}
}}
{{Starbox detail
| mass = {{Val|0.515|0.019}}
| radius = {{Val|0.511|0.018}}
| luminosity_bolometric = {{Val|0.04938|0.00090|fmt=commas}}
| temperature = {{Val|3805|51|fmt=commas}}
| metal_fe = {{Val|+0.13|0.16}}
| gravity = {{Val|4.69|0.07}}
| rotation = {{Val|18.86|0.10|0.09|u=days}}
| rotational_velocity = {{Val|2|p=<}}
| age_gyr =
}}
{{Starbox catalog
| names = {{odlist | BD=+61°195 | GJ=49 | HIP=4872 | LTT=10363 }}
}}
{{Starbox reference
| Simbad=GJ+49
| NSTED=GJ-49
}}
{{Starbox end}}
Gliese 49 is a star in the northern constellation of Cassiopeia. Visually, it is located 106 arcminutes north of the bright star γ Cassiopeiae. With an apparent visual magnitude of 9.56, it is not observable with the naked eye. It is located, based on the reduction of parallax data of Gaia ({{Val|101.47|0.03|ul=mas}}), 32.1 light-years away from the Solar System. The star is drifting closer to the Sun with a radial velocity of −6 km/s.
This object is a red dwarf star of spectral type M1.5V. Much dimmer than the Sun, it has a total luminosity that is 4.9% that of the Sun; it is, however, much brighter than other nearby red dwarfs such as Proxima Centauri or Wolf 359. It has an effective temperature of {{Val|3805|51|fmt=commas|ul=K}}. Its mass is 52% that of the Sun, and 51% of its radius.
It rotates on its axis with a projected rotation speed of under 2 km/s, and has a rotation period of 18.86 days. It has a metallic content similar to that of the Sun, with its index of metallicity [M / H] = +0.03. Although its age is not known exactly, it is younger than 250 million years.{{cn|date=December 2019}}
Gliese 49 has a similar proper motion to the red dwarf flare star V388 Cassiopeiae. The visual separation between the two is 295 arcseconds, which implies that the real distance between them is over {{val|2900|ul=AU|fmt=commas}}. Both stars are associated with the Hyades, as suggested by its young age and chromospheric activity levels.
Planetary system
One known planet is known to orbit Gliese 49. Gliese 49 b is a super-Earth planet detected by the radial velocity method.
{{OrbitboxPlanet begin}}
{{OrbitboxPlanet
| exoplanet=b
| mass_earth={{val|5.63|+0.67|−0.68}}
| period={{val|13.8508|+0.0053|−0.0051}}
| semimajor=0.0905 ± 0.0011
| eccentricity={{val|0.363|+0.099|−0.096}}
}}
{{Orbitbox end}}
References
{{reflist|refs=
{{cite simbad | title=GJ 49 | access-date=2019-12-16 }}
{{Cite Gaia DR2|522863309964987520}}
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}
| display-authors=1 | last1=Morales | first1=J. C.
| last2=Ribas | first2=I. | last3=Jordi | first3=C.
| title=The effect of activity on stellar temperatures and radii
| journal=Astronomy and Astrophysics
| volume=478 | issue=2 | pages=507–512 | year=2008
| bibcode=2008A&A...478..507M | arxiv=0711.3523
| doi=10.1051/0004-6361:20078324 | s2cid=16238033 }}
| display-authors=1 | last1=Makarov | first1=V. V.
| last2=Zacharias | first2=N. | last3=Hennessy | first3=G. S.
| title=Common Proper Motion Companions to Nearby Stars: Ages and Evolution
| journal=The Astrophysical Journal
| volume=687 | number=1 | pages=566–578 | year=2008
| bibcode=2008ApJ...687..566M | arxiv=0808.3414
| doi=10.1086/591638 | s2cid=17811620 }}
| last1=Perger | first1=M. | last2=Scandariato | first2=G.
| last3=Ribas | first3=I. | last4=Morales | first4=J. C.
| last5=Affer | first5=L. | last6=Azzaro | first6=M.
| last7=Amado | first7=P. J. | last8=Anglada-Escudé | first8=G.
| last9=Baroch | first9=D. | last10=Barrado | first10=D.
| last11=Bauer | first11=F. F. | last12=Béjar | first12=V. J. S.
| last13=Caballero | first13=J. A. | last14=Cortés-Contreras | first14=M.
| last15=Damasso | first15=M. | last16=Dreizler | first16=S.
| last17=González-Cuesta | first17=L. | last18=González Hernández | first18=J. I.
| last19=Guenther | first19=E. W. | last20=Henning, T. Herrero | first20=E.
| last21=Jeffers | first21=S. V. | last22=Kaminski | first22=A.
| last23=Kürster | first23=M. | last24=Lafarga | first24=M.
| last25=Leto | first25=G. | last26=López-González | first26=M. J.
| last27=Maldonado | first27=J. | last28=Micela | first28=G.
| last29=Montes | first29=D. | last30=Pinamonti | first30=M.
| last31=Quirrenbach | first31=A. | last32=Rebolo | first32=R.
| last33=Reiners | first33=A. | last34=Rodríguez | first34=E.
| last35=Rodríguez-López | first35=C. | last36=Schmitt | first36=J. H. M. M.
| last37=Sozzetti | first37=A. | last38=Suárez Mascareño | first38=A.
| last39=Toledo-Padrón | first39=B. | last40=Zanmar Sánchez | first40=R.
| last41=Zapatero Osorio | first41=M. R. | last42=Zechmeister | first42=M.
| title=Gliese 49: Activity evolution and detection of a super-Earth
| display-authors=1 | journal=Astronomy & Astrophysics
| volume=624 | id=A123 | pages=19 | date=April 2019
| doi=10.1051/0004-6361/201935192 | issn=0004-6361
| bibcode=2019A&A...624A.123P | arxiv=1903.04808 | s2cid=85497416 }}
| last=Houdebine | first=E. R.
| title=Observation and modelling of main-sequence star chromospheres – XIV. Rotation of dM1 stars
| journal=Monthly Notices of the Royal Astronomical Society
| volume=407 | number=3 | pages=1657–1673 | year=2010
| bibcode=2010MNRAS.407.1657H | doi=10.1111/j.1365-2966.2010.16827.x | doi-access= free}}
}}
{{Stars of Cassiopeia}}
Category:M-type main-sequence stars
Category:Cassiopeia (constellation)