upsilon Tauri

{{Starbox begin

| name = υ Tauri

}}

{{Starbox image

| image=

{{Location mark

|image=Taurus constellation map.svg|alt=|float=center|width=240

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=υ Tauri

|x=560|y=368

}}

|caption=Location of υ Tauri (circled)

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Taurus

| ra = {{RA|04|26|18.46368}}

| dec = {{DEC|+22|48|48.8885}}

| appmag_v = 4.28{{snd}}4.31

}}

{{Starbox character

| class = A8 Vn

| b-v = +0.25

| u-b = +0.14

| variable = δ Scuti

}}

{{Starbox astrometry

| radial_v = {{Val|32.2|1.1}}

| prop_mo_ra = +108.81

| prop_mo_dec = −46.80

| parallax = 21.21

| p_error = 0.25

| parallax_footnote =

| absmag_v = +0.91

}}

{{Starbox detail

| source =

| mass = 1.55

| radius = 1.803

| luminosity = 32.5

| temperature = {{Val|7398|252|fmt=commas}}

| gravity = 3.50

| metal_fe =

| rotational_velocity = 243

| rotation=0.415 d

| age_myr = 827

}}

{{Starbox catalog

| names = {{odlist | B=υ Tau, υ¹ Tau | F=69 Tauri | BD=+22 696 | FK5=2326 | HD=28024 | HIP=20711 | HR=1392 | SAO=76608 }}

}}

{{Starbox reference

| Simbad = ups+Tau

}}

Upsilon Tauri (υ Tauri) is a solitary, white-hued star in the zodiac constellation of Taurus, and is a member of the Hyades star cluster. It is faintly visible to the naked eye with an apparent visual magnitude of +4.3. Based upon an annual parallax shift of 21.21 mas seen from Earth, it is around 154 light years from the Sun.

Properties

File:UpsilonTauLightCurve.png for Upsilon Tauri, plotted from TESS data]]

This is an A-type main sequence star with a stellar classification of A8 Vn. It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +4.28 to +4.31 with a period of 3.56 hours. At an estimated age of 827 million years, it is spinning rapidly with a rotation period of just 0.415 days. This is giving the star an oblate shape with an equatorial bulge that is 9% larger than the polar radius.

Occasionally this star system shares the Bayer designation υ Tauri with 72 Tauri, which is separated from it by 0.29° in the sky.

Naming

With φ, κ¹, κ² and χ, it composed the Arabic were the Arabs' Al Kalbain, the Two Dogs. According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Kalbain were the title for five stars : φ as Alkalbain I, χ as Alkalbain II, κ¹ as Alkalbain III, κ² as Alkalbain IV and this star (υ) as Alkalbain V.

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{{cite simbad

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}}

Category:Delta Scuti variables

Category:A-type main-sequence stars

Category:Hyades (star cluster)

Tauri, Upsilon

Category:Taurus (constellation)

Category:Durchmusterung objects