QS Telescopii

{{Short description|Binary star system in the constellation Telescopium}}

{{Starbox image

| image = 250px

| caption = A visual band light curve for QS Telescopii, adapted from Rosen et al. (1996)

}}

{{Starbox observe

| epoch = J2000.0

| constell = Telescopium

| ra = {{RA|19|38|35.816}}

| dec = {{DEC|−46|12|57.11}}

| appmag_v =

}}

{{Starbox character

| type =

| class = M4.5{{±|0.5}}

| b-v =

| u-b =

| variable = AM Her

}}

{{Starbox astrometry

| radial_v = 110

| prop_mo_ra = +35.150

| prop_mo_dec = −25.496

| pm_footnote =

| parallax = 5.3378

| p_error = 0.0834

| parallax_footnote =

| absmag_v =

}}

{{Starbox orbit

| reference =

| period_unitless = 2.33 h

| eccentricity = 0.0

}}

{{Starbox detail

| component1 = White Dwarf

| mass = 0.71

| radius =

| luminosity =

| temperature = 17,500

| gravity =

| metal_fe =

| age_gyr =

| rotational_velocity =

}}

{{Starbox catalog

| names = {{odlist | V=QS Tel }}, EUVE J1938-46.2, RE 1938-461, AAVSO 1931-46

}}

{{Starbox reference

| Simbad = QS+Tel

| EPE =

}}

QS Telescopii is a faint, well-studied binary star system in the southern constellation Telescopium. It is composed of a white dwarf and main sequence donor star, locked into a close, circular orbit facing one another. Known as polars, material from the donor star does not form an accretion disk around the white dwarf, but rather streams directly onto it. This is due to the presence of the white dwarf's strong magnetic field. The pair undergo frequent shifts between a high and low accretion states, and it shifts between single and double accretion poles. The main pole is partially self-eclipsing.

The pair orbit each other with a period of 2.33 hours in a circular orbit. The donor star is a small red dwarf with an estimated stellar classification of M4−5. The white dwarf primary has 71% of the mass of the Sun and an effective temperature of 17,500 K. It has a magnetic field strength of 50–80 MG. The system is a source for X-ray emission.

References

{{reflist|refs=

{{cite journal

| title= Polars Changing State: Multiwavelength Long-Term Photometry and Spectroscopy of QS Telescopii, V834 Centauri, and BL Hydri

| display-authors=1 | last1=Gerke | first1=Jill R.

| last2=Howell | first2=Steve B. | last3=Walter | first3=Frederick M.

| journal=Publications of the Astronomical Society of the Pacific

| volume=118 | issue= 843 | date=2006 | pages=678–86

| doi=10.1086/503753|arxiv = astro-ph/0603097

| bibcode=2006PASP..118..678G | s2cid=14857705 }}

{{cite journal

| title=XMM-Newton observations of the X-ray soft polar QS Telescopii

| display-authors=4 | last1=Traulsen | first1=I.

| last2=Reinsch | first2=K.| last3=Schwope | first3=A. D.

| last4=Burwitz | first4=V.| last5=Dreizler | first5=S.

| last6=Schwarz | first6=R. | last7=Walter | first7=F. M.

| journal=Astronomy and Astrophysics

| volume=529 | issue=A116 | pages=7 | date=2011

| doi=10.1051/0004-6361/201016352 | arxiv=1103.4575

| bibcode=2011A&A...529A.116T | s2cid=119187792 }}

{{cite journal

| title=The donor stars of cataclysmic variables

| last=Knigge | first=Christian

| journal=Monthly Notices of the Royal Astronomical Society

| volume=373 | issue=2 | pages=484–502 | date=December 2006

| doi=10.1111/j.1365-2966.2006.11096.x | doi-access=free | arxiv=astro-ph/0609671

| bibcode=2006MNRAS.373..484K | s2cid=2616606 }}

{{cite journal |last1=Rosen |first1=S. R. |last2=Mittaz |first2=J. P. D. |last3=Buckley |first3=D. A. |last4=Layden |first4=A. C. |last5=Clayton |first5=K. L. |last6=McCain |first6=C. |last7=Wynn |first7=G. A. |last8=Sirk |first8=M. M. |last9=Osborne |first9=J. P. |last10=Watson |first10=M. G. |title=Accretion mode changes in QS Tel (RE 1938 — 461): EUVE, ROSAT and optical observations |journal=Monthly Notices of the Royal Astronomical Society |date=June 1996 |volume=280 |issue=4 |pages=1121–1142 |doi=10.1093/mnras/280.4.1121 |bibcode=1996MNRAS.280.1121R |doi-access=free |hdl=2381/38963 |hdl-access=free }}

{{cite journal

| title=Cataclysmic variables from the Calán-Tololo Survey - II. Spectroscopic periods

| last1=Augusteijn | first1=T. | last2=Tappert | first2=C.

| last3=Dall | first3=T. | last4=Maza | first4=J.

| display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society

| volume=405 | issue=1 | pages=621–637 | date=June 2010

| doi=10.1111/j.1365-2966.2010.16487.x | doi-access=free | bibcode=2010MNRAS.405..621A }}

{{cite simbad

| title=QS Tel | access-date=2021-11-25 }}

}}

QS Telescopii

See also

References

Further reading