SIMBAD references

1995A&A...297..391N - Astronomy and Astrophysics, volume 297, 391-417 (1995/5-2)

ROSAT survey observation of T Tauri stars in Taurus.


Abstract (from CDS):

We study the X-ray emission of T Tauri stars (TTS) in Taurus-Auriga as observed with the spatially unbiased flux-limited ROSAT All-Sky Survey. Our detection rates are comparable with Einstein Observatory results: 43 out of 65 (66%) weak-line TTS (WTTS) and 9 out of 79 (11%) classical TTS (CTTS) exhibit X-ray emission above the ROSAT survey detection limit. Spectral fits give results consistent with Raymond-Smith spectra and emission temperatures of ∼1keV for both CTTS and WTTS. However, we find that CTTS and WTTS have significantly different X-ray luminosity functions, even when correcting luminosities for individual X-ray spectra (absorption and emission energy). Medians of X-ray luminosities log (LX/erg/sec) are 29.701±0.045 for WTTS and 29.091±0.032 for CTTS, all in 140pc distance. A strong correlation between X-ray surface flux and stellar rotation indicates that WTTS are intrinsically more X-ray active than CTTS because WTTS rotate faster. However, rotation is not the only parameter that determines X-ray activity, we find that X-ray luminosity is correlated with stellar mass, bolometric luminosity, effective temperature, and stellar age. Furthermore, X-ray emission of CTTS appears to be harder than that of WTTS.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: late-type - stars: pre-main sequence - X-rays: stars

VizieR on-line data: <Available at CDS (J/A+A/297/391): table1 table2 table3 table4 table5 table6 tablea1>

CDS comments: IRAS 05023+2527 = IRAS 05022+2527

Simbad objects: 154

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