7 Tauri

{{Short description|Multiple star system in the constellation Taurus}}

{{Starbox observe 2s

| epoch = J2000

| constell = Taurus

| component1 = A

| ra1 = {{RA|03|34|26.629}}

| dec1 = {{DEC|+35|27|51.86}}

| appmag_v1 = 6.58

| component2 = B

| ra2 = {{RA|03|34|26.633}}

| dec2 = {{DEC|+35|27|52.17}}

| appmag_v2 = 6.84

}}

{{Starbox character

| component1 = A

| class = A3V

| b-v = +0.13

| u-b =

| variable =

| component2 = B

| class2 = A3V

| b-v2 = +0.13

| u-b2 =

| variable2 =

}}

{{Starbox astrometry

| radial_v = +28.1

| prop_mo_ra = +9.908

| prop_mo_dec = −28.201

| pm_footnote =

| parallax = 5.4993

| p_error = 0.0587

| parallax_footnote =

| absmag_v = +0.5/+0.6

}}

{{Starbox orbit

| reference =

| period = 522.16

| eccentricity = 0.679

| axis = 0.625

}}

{{Starbox detail

| component1 = A

| mass = 2.5

| radius = 9.0

| gravity =

| metal_fe =

| temperature = 8,551

| luminosity = 52

| rotational_velocity =

| rotation =

| age_myr =

| component2 = B

| mass2 = 2.5

| temperature2 =

}}

{{Starbox catalog

| names = {{odlist | F=7 Tau | BD=+23°473 | HD=22091 | HIP=16664 | HR=1086 }}

}}

{{Starbox reference

| Simbad = 6+Tau

}}

7 Tauri is a multiple star in the northern constellation of Taurus. It has a combined apparent visual magnitude of 5.95, so, according to the Bortle scale, it is faintly visible from suburban skies at night. Measurements made with the Gaia spacecraft show an annual parallax shift of {{val|5.5|ul=mas}}, which is equivalent to a distance of around 593 light years from the Sun.

7 Tauri is a binary star with two nearly equal components about {{val|0.7|ul="}} apart, designated as A and B. The spectrum of each star matches a stellar classification of A7V. {{val|22|u="}} away is a 10th-magnitude star, component C, which is itself a spectroscopic binary. In the past, these stars had been treated as a single system, but they are now known to have different proper motions and somewhat different distances.

References

{{Reflist|refs=

{{cite journal |bibcode=2018AJ....156..102S |title=The TESS Input Catalog and Candidate Target List |last1=Stassun |first1=Keivan G. |last2=Oelkers |first2=Ryan J. |last3=Pepper |first3=Joshua |last4=Paegert |first4=Martin |last5=De Lee |first5=Nathan |last6=Torres |first6=Guillermo |last7=Latham |first7=David W. |last8=Charpinet |first8=Stéphane |last9=Dressing |first9=Courtney D. |last10=Huber |first10=Daniel |last11=Kane |first11=Stephen R. |last12=Lépine |first12=Sébastien |last13=Mann |first13=Andrew |last14=Muirhead |first14=Philip S. |last15=Rojas-Ayala |first15=Bárbara |last16=Silvotti |first16=Roberto |last17=Fleming |first17=Scott W. |last18=Levine |first18=Al |last19=Plavchan |first19=Peter |author20=the TESS Target Selection Working Group |journal=The Astronomical Journal |year=2018 |volume=156 |issue=3 |page=102 |doi=10.3847/1538-3881/aad050 |arxiv=1706.00495 |s2cid=73582386 |doi-access=free }}

{{cite journal |last1=Fabricius |first1=C. |last2=Høg |first2=E. |last3=Makarov |first3=V. V. |last4=Mason |first4=B. D. |last5=Wycoff |first5=G. L. |last6=Urban |first6=S. E. |title=The Tycho double star catalogue |journal=Astronomy & Astrophysics |date=March 2002 |volume=384 |issue=1 |pages=180–189 |doi=10.1051/0004-6361:20011822 |issn=0004-6361 |bibcode=2002A&A...384..180F |doi-access=free}}

{{cite journal | last1 = Anderson | first1 = E. | last2 = Francis | first2 = Ch. | title = XHIP: An extended hipparcos compilation | journal = Astronomy Letters | date = May 2012 | volume = 38 | issue = 5 | pages = 331–346 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773712050015 | bibcode = 2012AstL...38..331A | arxiv = 1108.4971| s2cid = 119257644 }}

{{cite journal |bibcode=1998AstL...24..288T |title=New spectroscopic components in six multiple systems |last1=Tokovinin |first1=A. A. |journal=Astronomy Letters |year=1998 |volume=24 |issue=3 |page=288 }}

{{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 |doi=10.1134/S1063773706110065 |issn=1063-7737 |bibcode=2006AstL...32..759G |arxiv=1606.08053|s2cid=119231169 }}

{{cite journal

| display-authors=1

| last1=Malkov | first1=O. Yu.

| last2=Tamazian | first2=V. S.

| last3=Docobo | first3=J. A.

| last4=Chulkov | first4=D. A.

| title=Dynamical Masses of a Selected Sample of Orbital Binaries

| journal=Astronomy & Astrophysics

| volume=546 | id=A69 | pages=5 | date=2012

| doi=10.1051/0004-6361/201219774

| bibcode=2012A&A...546A..69M

| doi-access=free