Sigma1 Gruis

{{other stars by Bayer designation|Sigma Gruis{{!}}σ Gruis}}

{{Starbox begin

| name = Sigma¹ Gruis

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Grus

| ra = {{RA|22|36|29.30230}}

| dec = {{DEC|−40|34|57.7391}}

| appmag_v = 6.26

}}

{{Starbox character

| class = A3 Vn

| b-v = +0.12

| u-b =

| r-i =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|+6.9|3.4}}

| prop_mo_ra = +46.00

| prop_mo_dec = −72.64

| parallax = 14.2651

| p_error = 0.0751

| parallax_footnote =

| absmag_v = +2.11

}}

{{Starbox detail

| source =

| mass = 2.00

| radius = 2.0

| luminosity = 12

| temperature = {{Val|9230|314|fmt=commas}}

| gravity = {{Val|4.24|0.14}}

| metal_fe =

| rotational_velocity = {{Val|163.4|2.0}}

| age_myr = 194

}}

{{Starbox catalog

| names = {{odlist | B=σ¹ Gru | CD=−41°14959 | FK5=3811 | HD=214085 | HIP=111594 | HR=8600 | SAO=231211 }}

}}

{{Starbox reference

| Simbad = sig01+Gru

}}

Sigma¹ Gruis, a Latinization of σ¹ Gruis, is a star in the constellation Grus. It is a dim, white-hued star near the lower limit for visibility to the naked eye with an apparent visual magnitude of 6.26. This object is located {{convert|70.1|pc|ly|order=flip}} distant from the Sun based on parallax. The radial velocity of this star is poorly constrained, but it appears to be drifting further away at the rate of +7 km/s.

This is an A-type main-sequence star with a stellar classification of A2 Vn; a star that is currently fusing its core hydrogen. It has a relatively high rate of spin as indicated by the 'n' suffix, showing a projected rotational velocity of 163 km/s. This object is 194 million years old with double the mass and radius of the Sun. The star is radiating 12 times the luminosity of the Sun from its photosphere at an effective temperature of 9,230 K. It is a source of X-ray emission, which may indicate it has an unseen stellar companion.

References

{{reflist|refs=

{{citation

| title=Validation of the new Hipparcos reduction

| last1=van Leeuwen | first1=F.

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664 | date=2007

| arxiv=0708.1752 | bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}

{{citation

| 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=. }}

{{citation | display-authors=1

| last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L.

| last3=Covino | first3=S. | last4=Pozzi | first4=A.

| title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)

| journal=Astronomy & Astrophysics

| volume=367 | pages=521–24 | date=2001 | edition=3rd

| bibcode=2001A&A...367..521P | doi=10.1051/0004-6361:20000451

| arxiv=astro-ph/0012289 | s2cid=425754 | postscript=. }}

{{citation

| title=X-ray emission from A-type stars

| last1=Schröder | first1=C. | last2=Schmitt | first2=J. H. M. M.

| journal=Astronomy and Astrophysics | postscript=.

| volume=475 | issue=2 | date=November 2007 | pages=677–684

| doi=10.1051/0004-6361:20077429 | bibcode=2007A&A...475..677S | doi-access=free }}

{{citation

| last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A.

| title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets

| journal=The Astrophysical Journal

| volume=804 | issue=2 | pages=146 | year=2015

| bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146

| arxiv=1501.03154 | s2cid=33401607 | postscript=. }}

{{citation

| last1=Díaz | first1=C. G. | last2=González | first2=J. F.

| last3=Levato | first3=H. | last4=Grosso | first4=M.

| title=Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum

| display-authors=1 | journal=Astronomy & Astrophysics

| volume=531 | page=A143 |date=July 2011

| doi=10.1051/0004-6361/201016386 | bibcode=2011A&A...531A.143D

| arxiv=1012.4858 | s2cid=119286673 | postscript=.}}