Delta2 Telescopii

{{other stars by Bayer designation|Delta Telescopii{{!}}δ Telescopii}}

{{Starbox begin

| name = Delta² Telescopii

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Telescopium

| ra = {{RA|18|32|01.94437}}

| dec = {{DEC|−45|45|26.5636}}

| appmag_v = 5.05

}}

{{Starbox character

| type = subgiant

| class = B3 IV/V or B3 III

| b-v = −0.12

| u-b = −0.52

| r-i =

| variable =

}}

{{Starbox astrometry

| radial_v =

| prop_mo_ra = +0.16

| prop_mo_dec = −10.23

| parallax = 2.73

| p_error = 0.26

| parallax_footnote =

| absmag_v = −1.46

}}

{{Starbox orbit

| reference =

| period_unitless = 21.7056 d

| eccentricity = 0.22

| periastron = 2,435,216.669 JD

| periarg = 12.7

| k1 = 34.9

}}

{{Starbox detail

| source =

| mass = {{Val|7.6|0.1}}

| radius = 7,2

| luminosity_bolometric = 5,129

| temperature = 17,100

| gravity = 3.37

| metal_fe =

| rotational_velocity = 0 or 45

| age_myr = {{Val|39.8|7.6}}

}}

{{Starbox catalog

| names = {{odlist | B=δ² Tel | CD=−45°12556 | FK5= | HD=170523 | HIP=90853 | HR=6938 | SAO=229095 }}

}}

{{Starbox reference

| Simbad = del02+Tel

}}

Delta² Telescopii is a blue-white-hued binary star system in the southern constellation of Telescopium. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.05. The distance to this system, as determined with an annual parallax shift of 2.73 mas, is roughly 1,200 light-years. At that distance, the visual magnitude of the star is diminished by an extinction of 0.36 due to interstellar dust. The pair have an orbital period of 21.7 days and an eccentricity of 0.22. For the merged stellar classification, Houk (1978) gives B3 IV/V, while Levato (1975) lists a more evolved class of B3 III. It appears to be a relatively young system, barely 40 million years old.

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=Spatial distribution and kinematics of OB stars

| last1=Gontcharov | first1=G. A.

| journal=Astronomy Letters

| volume=38 | issue=11 | pages=694–706 | date=November 2012

| doi=10.1134/S1063773712110035 | bibcode=2012AstL...38..694G

| arxiv=1606.09028 | s2cid=119108982 | postscript=. }}

{{citation

| display-authors=1 | last1=Pourbaix | first1=D.

| last2=Tokovinin | first2=A. A. | last3=Batten | first3=A. H.

| last4=Fekel | first4=F. C. | last5=Hartkopf | first5=W. I.

| last6=Levato | first6=H. | last7=Morrell | first7=N. I.

| last8=Torres | first8=G. | last9=Udry | first9=S.

| year=2004 | pages=727–732 | volume=424

| title=SB9: The Ninth Catalogue of Spectroscopic Binary Orbits

| journal=Astronomy & Astrophysics | postscript=.

| bibcode=2004A&A...424..727P | doi=10.1051/0004-6361:20041213 | arxiv=astro-ph/0406573| s2cid=119387088 }}

{{citation

| last1=Levato | first1=H.

| title=Rotational velocities and spectral types for a sample of binary systems

| journal=Astronomy and Astrophysics

| volume=19 | pages=91 | year=1975

| bibcode=1975A&AS...19...91L | postscript=. }}

{{citation

| display-authors=1 | last1=Hohle | first1=M. M.

| last2=Neuhäuser | first2=R. | last3=Schutz | first3=B. F.

| title=Masses and luminosities of O- and B-type stars and red supergiants

| journal=Astronomische Nachrichten

| volume=331 | issue=4 | page=349 | date=April 2010

| doi=10.1002/asna.200911355 | bibcode=2010AN....331..349H

| arxiv=1003.2335 | s2cid=111387483 | postscript=. }}

{{citation

| display-authors=1 | last1=Tetzlaff | first1=N.

| last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M.

| title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun

| journal=Monthly Notices of the Royal Astronomical Society

| volume=410 | issue=1 | pages=190–200 | date=January 2011

| doi=10.1111/j.1365-2966.2010.17434.x | doi-access=free | bibcode=2011MNRAS.410..190T

| arxiv=1007.4883 | s2cid=118629873 | postscript=. }}

{{citation

| last1=Houk | first1=Nancy | postscript=.

| title=Michigan catalogue of two-dimensional spectral types for the HD stars

| volume=2 | publication-place=Ann Arbor

| publisher=Dept. of Astronomy, University of Michigan

| year=1978 | bibcode=1978mcts.book.....H }}

{{citation

| last1=Uesugi | first1=Akira | last2=Fukuda | first2=Ichiro

| title=Catalogue of rotational velocities of the stars

| journal=Contributions from the Institute of Astrophysics and Kwasan Observatory

| date=1970 | publisher=University of Kyoto

| bibcode=1970crvs.book.....U | postscript=. }}

{{citation

| last1=Fernie | first1=J. D. | postscript=.

| title=New UBVRI photometry for 900 supergiants

| journal=Astrophysical Journal Supplement Series

| volume=52 | pages=7–22 | date=May 1983

| doi=10.1086/190856 | bibcode=1983ApJS...52....7F | doi-access=free }}

{{cite simbad

| title=del02 Tel

| accessdate=2017-06-07 | postscript=. }}

}}

Category:B-type subgiants

Category:Spectroscopic binaries

Category:Durchmusterung objects