Identification of New M Dwarfs in the Solar Neighborhood

By B. Riaz, J. Gizis, J. Harvin. 2003

165 citations recorded by the source corpus.

We present the results from a spectroscopic study of 1080 nearby active M dwarfs, selected by correlating the Two Micron All Sky Survey and ROSAT catalogs. We have derived the spectral types and estimated distances for all of our stars. The spectral types range between K5 and M6. Nearly half of our stars lie within 50 pc. We have measured the equivalent width of the Hα emission line. Our targets show an increase in chromospheric activity from early to midspectral types, with a peak in activity around M5. Using the count rate and hardness ratios obtained from the ROSAT catalog, we have derived the X-ray luminosities. Our stars display a "saturation-type" relation between the chromospheric and coronal activity. The relation is such that log LX/Lbol remains "saturated" at a value of approximately -3 for varying Hα equivalent width. We have found 568 matches in the USNO-B catalog and have derived the tangential velocities for these stars. There is a slight trend of decreasing chromospheric activity with age, such that the stars with higher vtan have lower Hα equivalent widths. The coronal emission, however, remains saturated at a value of log LX/Lbol ∼ -3 for varying tangential velocities, suggesting that the coronal activity remains saturated with age. We do not find any break in the saturation-type relation at the spectral type at which stars become fully convective (∼M3.5). Most of the stars in our sample show more coronal emission than the dMe stars in the Hyades and Praesepe and have vtan < 40 km s-1, suggesting a young population.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/960eb7295c46c9cc6865a2aff17d1aa63f399cc2

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In Astronomy and Astrophysics

1. Michael C. Liu
2. B. Bowler
3. Eric Mamajek
4. K. Allers
5. T. Dupuy
6. E. Shkolnik
7. A. Kraus
8. D. Lafrèniere

In Instrumentation

1. Michael C. Liu
2. B. Bowler
3. Eric Mamajek
4. K. Allers
5. E. Shkolnik
6. A. Kraus
7. T. Dupuy
8. D. Lafrèniere

Citations in the corpus

• The star formation history and accretion-disc fraction among the K-type members of the Scorpius–Centaurus OB association (2016, unknown): “…omitted stars which were studied in Mamajek et al. (2002), Preibisch et al. (1998), Preibisch et al. (2001), Preibisch et al. (2002), Ardila et al. (2000), Köhler et al. (2000), Slesnick et al. (2006), Krautter et al. (1997), Wichmann et al. (1997), Riaz et al. (2006), and Torres et al. (2006).”
• IDENTIFYING THE YOUNG LOW-MASS STARS WITHIN 25 PC. I. SPECTROSCOPIC OBSERVATIONS (2009, background): “For example, Riaz et al. (2006) collected lowresolution spectra of ≈800 M dwarfs (M0–M5) detected with 6 The Röntgensatellit (ROSAT) was a joint German, US, and British X-ray observatory operational from 1990 to 1999.”
• INTRINSIC COLORS, TEMPERATURES, AND BOLOMETRIC CORRECTIONS OF PRE-MAIN-SEQUENCE STARS (2013, background): “…(3) This Work (4) Houk & Cowley (1975); (5) Converted from Tycho-2 using Mamajek et al. (2002, 2006); (6) Torres et al. (2006); (7) Hawley et al. (1996); (8) Riaz et al. (2006); (9) Gray et al. (2006); (10) Jeffries (1995); (11) Henden et al. (2012); (12) Zuckerman & Song (2004); (13) Weis…”
• BAYESIAN ANALYSIS TO IDENTIFY NEW STAR CANDIDATES IN NEARBY YOUNG STELLAR KINEMATIC GROUPS (2012, methodology): “…b Proper motion fromUCAC3 catalog (Zacharias et al. 2009), unless stated otherwise. c ROSAT X-ray flux calculated from Riaz et al. (see Section 5.4;2006) in erg s−1 cm−2. d Hα EW from Riaz et al. (2006), unless stated otherwise. e Lithium EW from Mentuch et al. (2008), unless stated otherwise.”
• THE ASTRALUX LARGE M-DWARF MULTIPLICITY SURVEY (2012, background): “J04143060+2851298 and J04143109+ 2851518, both from the Riaz et al. (2006) sample, are separated by only 23′′ and although the estimated spectroscopic distances of 55 and 72 pc are not fully equal, they are consistent to within the 37% error.”
• CARMENES input catalogue of M dwarfs. I. Low-resolution spectroscopy with CAFOS (2015, unknown): “…2003; Reid04: Reid et al. 2004; Boc05: Bochanski et al. 2005; Scho05: Scholz et al. 2005; Gray06: Gray et al. 2006; Mon06: Montagnier et al. 2006; Riaz06: Riaz et al. 2006; SB06: Sánchez-Blázquez et al. 2006; Dae07: Daemgen et al. 2007; Eis07: Eisenbeiss et al. 2007; Reid07: Reid et al. 2007;…”
• PLANETS AROUND LOW-MASS STARS (PALMS). IV. THE OUTER ARCHITECTURE OF M DWARF PLANETARY SYSTEMS (2014, background): “0Ve star detected in the ROSAT and GALEX surveys (Riaz et al. 2006).”
• A STELLAR CENSUS OF THE TUCANA–HOROLOGIUM MOVING GROUP (2014, background): “Most of our new members are not found in the active M dwarf census of Riaz et al. (2006), and indeed, the majority do not have ROSAT counterparts at all; only 53 of our 129 previously unidentified members have an X-ray counterpart in the ROSAT All-Sky Survey within <30′′.”