Theta2 Crucis

{{Starbox begin

| name=θ² Crucis

}}

{{Starbox image

| image = 250px

| caption = A light curve for Theta² Crucis, plotted from TESS data

}}

{{Starbox observe

| epoch=J2000

| ra={{RA|12|04|19.22008}}

| dec={{DEC|−63|09|56.5167}}

| appmag_v=4.70 - 4.74

| constell=Crux

}}

{{Starbox character

| class=B3 V

| b-v=−0.08

| u-b=−0.61

| variable=β Cep

}}

{{Starbox astrometry

| radial_v=+16.3

| prop_mo_ra=−18.467

| prop_mo_dec=+0.467

| parallax=4.7314

| p_error=0.1276

| parallax_footnote=

| absmag_v=−2.35

}}

{{Starbox orbit

| reference =

| period_unitless = 3.428 d

| eccentricity = 0.00

| periastron = 2419604.367 JD

| k1 = 51.3

}}

{{Starbox detail

| mass=5.9

| radius=6.9

| luminosity=1,935

| temperature=15,361

| metal_fe=+0.20

| rotation=

| rotational_velocity=23

| gravity=3.55

| age_myr=18.5

}}

{{Starbox catalog

| names=θ² Cru, CD−62°610, HD 104841, HIP 58867, HR 4603, SAO 251717

}}

{{Starbox reference

| Simbad = tet02+Cru

}}

Theta² Crucis, Latinized from θ² Crucis, is a spectroscopic binary star in the constellation Crux. This pair of stars complete an orbit every 3.4280 days and they have a low orbital eccentricity that is close to 0.0. Theta² Crucis is located at about 690 light-years from the Sun.

Since a member of the system is a β Cephei-type variable star, the magnitude is not fixed but varies slightly between +4.70 and +4.74. The period of this variability is 0.0889 days. The system is categorized as is a blue-white B-type main sequence star with a stellar classification of B3 V, although it has also been classified as a subgiant. Evolutionary models show it at a late stage of its main sequence life.

References

{{reflist|refs=

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{{cite web

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| postscript=. }}

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{{cite web | author=Samus, N. N. | author2=Durlevich, O. V. |display-authors=etal | title=General Catalogue of Variable Stars |date=January 2009 | work=VizieR | url=http://cdsarc.u-strasbg.fr/viz-bin/Cat?cat=B/gcvs& | accessdate=2010-05-19 }} Note: query for GCVS "tet 2 Cru".

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{{Cite journal | author=Johnson, H. L. | author2=Iriarte, B. | author3=Mitchell, R. I. | author4=Wisniewskj, W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | date=1966 | page=99 | bibcode=1966CoLPL...4...99J }}

{{cite journal | author=Batten, A. H. | title=Sixth catalogue of the orbital elements of spectroscopic binary systems | journal=Publications of the Dominion Astrophysical Observatory, Victoria | volume=13 | date=1967 | bibcode=1967PDAO...13..119B | pages=154–155 }}

{{citation

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| doi=10.1051/0004-6361:20041213 | bibcode=2004A&A...424..727P

| arxiv=astro-ph/0406573 | s2cid=119387088

| postscript=. }}