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Elements for two T Tauri variables in Taurus

by Ivan Adamin in July-August 2013 (#1)

There are two T Tauri-alike variable sources were discovered in the constellation of Taurus by the VS-COMPAS team. Elements are refined.

T Tauri itself is the prototype for a class of very young stars, still in the process of gravitational contraction; that is, they have yet to evolve to reach the main sequence. These are pre-main sequence stars - the youngest visible of F, G, K, M spectral type.

2MASS J05003003+1723591 (WTTS/ROT)
J2000.0:05 00 30.04 +17 23 59.2
Mag. range:11.78 - 11.93 V
Epoch:HJD 2451594.56 (20 Feb 2000)
Period:3.08 days

Target stars are VSX J034605.3+292034 and a Weak-line T Tauri star 2MASS J05003003+1723591. For VSX J034605.3+292034, there is a possible flare at HJD = 2454743 that reaches 12.05 in CRTS data. The star is present in "Compiled catalog of Per OB2 star forming complex" (Belikov+, 2002).

2MASS J05003003+1723591. (WTTS/ROT). Period is 3.08 days.
by Andrey Prokopovich, Ivan Adamin (VS-COMPAS), Sebastian Otero

Mean magnitude changes in ASAS-3 data and the period may be slightly different between datasets for 2MASS J05003003+1723591 (WTTS/ROT), which is a Weak-line T Tauri star. Type is derived from 1998A&AS..132..173L. Spectral type is confirmed to be G5IV. The brightness varies between 11.78 and 11.93 V. Rotational period believed to be 3.08 days, according to the NSVS data.

Roughly half of T Tauri stars have circumstellar disks, which in this case are called protoplanetary discs because they are probably the progenitors of planetary systems like the solar system. Circumstellar discs are estimated to dissipate on timescales of up to 10 million years. Most T Tauri stars are in binary star systems. In various stages of their life, they are called Young Stellar Objects (YSOs).

Object Designation RA (J2000) DEC (J2000) Type Epoch * Period Mag. Range
2MASS J05003003+1723591 05 00 30.04 +17 23 59.2 WTTS/ROT 1594.56000 3.08 11.78 - 11.93 V
VSX J034605.3+292034 03 46 05.31 +29 20 34.2 TTS/ROT 4743.67300 0.3510939 12.4 - 12.7 CV

* Epoch is given as HJD-2450000

View Issue Contents (July-August 2013)


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In this issue:
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BL Bootis stars - anomalous Cepheids by Ivan Adamin

A revision of NSV 13538 = NSVS 17231162 by Alexandr Ditkovsky

NSVS 11075037 = Dauban V53:
updated elements of a Mira variable in Hercules
by Siarhey Hadon

Pulsating variable stars and the Hertzsprung-Russell diagram
by Siarhey Hadon, Ivan Adamin

RS Puppis: the light echoes calibrate standard candles for accurate distance measurements
by Ivan Adamin

SS Lacertae: The non-eclipsing eclipsing binary by Ivan Adamin

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