PW Telescopii

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PW Telescopii
PWTelLightCurve.png
A light curve for PW Telescopii, plotted from TESS data [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Telescopium
Right ascension 19h 33m 21.62239s [2]
Declination −45° 16′ 18.3946″ [2]
Apparent magnitude  (V)5.58±0.01 [3]
Characteristics
Spectral type A0 Vp (SrCr) [4]
B−V color index −0.04 [5]
Variable type α2 CVn [6]
Astrometry
Radial velocity (Rv)−10.3±2.7 [7]  km/s
Proper motion (μ)RA: −17.146  mas/yr [2]
Dec.: −24.625  mas/yr [2]
Parallax (π)8.2532 ± 0.1701  mas [2]
Distance 395 ± 8  ly
(121 ± 2  pc)
Absolute magnitude  (MV)+0.17 [8]
Details
Mass 2.79±0.14 [9]   M☉
Radius 3.41 [10]   R☉
Luminosity 100+26
−21 [9]   L☉
Surface gravity (log g)3.68 [11]   cgs
Temperature 10,070 [12]   K
Metallicity [Fe/H]+1.09 [13]   dex
Rotational velocity (v sin i)55±6 [14]  km/s
Age 363 [15]   Myr
Other designations
63 G. Telescopii [16] , PW Tel, CD−45°13296, CPD−45°9740, FK5  3558, GC  29681, HD  183806, HIP  96178, HR  7416, SAO  229741 [17]
Database references
SIMBAD data

PW Telescopii, also known as HD 183806 or simply PW Tel, is a solitary variable star [18] located in the southern constellation Telescopium. It has an average apparent magnitude of 5.58, [3] making it faintly visible to the naked eye. Based on parallax measurements from the Gaia satellite, the star is estimated to be 395 light years distant. [2] It appears to be approaching the Solar System with a heliocentric radial velocity of −10  km/s . [7] The value is somewhat constrained, having an uncertainty of 26%. At its current distance, PW Tel's brightness is diminished by 0.05 magnitudes due to interstellar dust. [19]

PW Tel was first noticed to vary in brightness in observations taken in 1978 by Pierre Renson. [20] The star was confirmed to be variable and was given the variable star designation PW Telescopii in 1981. Further observations by Jean Manfroid in 1985 improved earlier data, including the star's period. [21] PW Tel is an α2 CVn variable [6] that has an amplitude of 0.011 magnitudes within the visual passband and a period of 2.92 days. [22]

With a stellar classification of A0 Vp (SrCr), PW Tel is a chemically peculiar A-type main-sequence star. [4] It has been recognised as an Ap star, as indicated by the "p" suffix, since the early 20th century, and it shows an overabundance of strontium and chromium in its spectrum. The abundance of some metals in the spectrum is several hundred times higher than in the Sun and it has an overall metallicity of [Fe/H] = 1.09, but this only reflects levels of those elements in the photosphere, not the whole star. [13] Like most such stars it spins relatively slowly, with a projected rotational velocity of 55  km/s . [14]

With 2.8 times the mass of the Sun [9] and 3.4 times its radius, [10] PV Tel radiates 100 times the luminosity of the Sun [9] from its photosphere at an effective temperature of 10,070  K , [12] giving it a bluish-white hue. PW Tel is metal enriched, having an iron abundance over 10 times that of the Sun. [23]

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<span class="mw-page-title-main">HD 118285</span> SPB star in the constellation Chamaeleon.

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<span class="mw-page-title-main">HD 174474</span> High proper motion star; Telescopium

HD 174474, also designated as HR 7095 or rarely 35 G. Telescopii, is a solitary white-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.17, placing it near the limit for naked eye visibility. The object is located relatively close at a distance of 244 light years based on Gaia DR3 parallax measurements but is drifting closer with a heliocentric radial velocity of −44 km/s. At its current distance, HD 174474's brightness is diminished by 0.26 magnitudes due to interstellar dust. It has an absolute magnitude of +1.61.

<span class="mw-page-title-main">QQ Telescopii</span> Delta Scuti variable; Telescopium

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<span class="mw-page-title-main">HD 186756</span> K-type giant; Telescopium

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<span class="mw-page-title-main">HD 177406</span> Star in the constellation of Telescopium

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References

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