X-ray and Molecular Emission from the Nearest Region of Recent Star Formation

Kastner, Joel H.; Zuckerman, B.; Weintraub, David A.; Forveille, T.

doi:10.1126/science.277.5322.67

Cited by 390 publications

(479 citation statements)

References 19 publications

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“…In its isolation, this star more closely resembles stars such as b Pic and the TW Hya association members, with estimated ages in the 8È20 Myr range (Barrado y et al 1999 ; Stau †er, HartNavascues mann, & Barrado y Navascues 1995 ; Kastner et al 1997), rather than more conventional Herbig Ae stars. Of the small number of stars which have been coronagraphically imaged in the optical and near-IR, the disk of HD 163296 most closely resembles the Herbig Be star HD 141569 at optical wavelengths (Weinberger et al 1999(Weinberger et al , 2000.…”

Section: Discussionmentioning

confidence: 99%

STIS Coronagraphic Imaging of the Herbig Ae Star: HD 163296

Grady

Devine

Woodgate

et al. 2000

ApJ

128

217

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Coronagraphic imaging with the Space Telescope Imaging Spectrograph on board the Hubble Space T elescope reveals a D450 AU radius circumstellar disk around the Herbig Ae star HD 163296. A broadband (0.2È1.0 km) reÑected light image shows the disk oriented at a position angle of 140¡^5¡ and inclined to our line of sight by D60¡^5¡. The disk includes an annulus of reduced scattering at 325 AU and exhibits a Ñat trend of surface brightness in to 180È122 AU consistent with a cleared (1A .5È1A), central zone. For r º 370 AU the disk surface brightness drops as r to the approximately [3.5 power. The disk cannot be traced beyond 450 AU in our data. The disk is accompanied by a chain of nebulosities at compatible with detection of a Herbig-Haro Ñow. The HD 163296 disk most P.A.\42¡ .5^3¡ .5, closely resembles the disk of HD 141569. As in the HD 141569 system, the dynamical e †ects of a planet may be necessary to explain the structure in the outer disk.

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Section: Discussionmentioning

confidence: 99%

STIS Coronagraphic Imaging of the Herbig Ae Star: HD 163296

Grady

Devine

Woodgate

et al. 2000

ApJ

128

217

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“…The members of the TW Hydrae Association have ages of only a few to 10 million years despite their distance from a molecular cloud (Jensen, Cohen, & Neuhäuser 1998;Webb et al 1999). TW Hya (the star) stands in contrast to its namesakes by virtue of its large Ha equivalent width (220 Å ; Kastner et al 1997), CO emission (Weintraub, Sandell, & Duncan 1989;Zuckerman, Forveille, & Kastner 1995;Kastner et al 1997), and molecular hydrogen (Weintraub, Kastner, & Bary 2000). Furthermore, the considerable 1.1 and 7 mm flux densities of 874 and 8 mJy, respectively (Weintraub et al 1989;Wilner et al 2000)-comparable, after distance scaling, to flux densities of CTTSs at much larger dis-tances-argue for an optically thick, massive (∼10 Ϫ2 M , ) circumstellar disk.…”

Section: ϫ2mentioning

confidence: 99%

“…TW Hydrae (TW Hya; K7 Ve, d ≈ pc) is the eponymous member of a nearby group of young 56 stars (Kastner et al 1997;Webb et al 1999). The members of the TW Hydrae Association have ages of only a few to 10 million years despite their distance from a molecular cloud (Jensen, Cohen, & Neuhäuser 1998;Webb et al 1999).…”

Section: ϫ2mentioning

confidence: 99%

Near-Infrared Coronagraphic Imaging of the Circumstellar Disk around TW Hydrae

Trilling¹,

Koerner²,

Barnes³

et al. 2001

The Astrophysical Journal

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We present ground-based near-infrared (H-band) imaging of the circumstellar disk around the nearby classical T Tauri star TW Hydrae. The scattered-light image shows a face-on disk with a radius of 4Љ (corresponding to 225 AU) and a morphology that agrees with recent images from the Hubble Space Telescope and the Very Large Array. The best-fit power-law for the disk's radial surface brightness profile obeys the law . We use our Ϫ3.3‫3.0ע‬ r image and published continuum flux densities to derive properties of the disk with a simple model of emission from a flat disk. The best-fit values for disk mass and inner radius are 0.03 and 0.3 AU, respectively; the M , best-fit values for the temperature, density, and grain opacity power-law exponents (q, p, and b) are 0.7, 1.3, and 0.9, respectively. These properties are similar to those of disks around classical T Tauri stars located in more distant molecular clouds. Because of TW Hydrae's nearby location and pole-on orientation, it is a uniquely favorable object for future studies of radial disk structure at the classical T Tauri stage.

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“…Only later similar stars and member candidates were found by accident and by systematic searches among infrared and Xray sources (Hoff et al 1997, Kastner et al 1997, Jensen et al 1998, Sterzik et al 1999, Webb et al 1999, Zuckerman et al 2001. More kinematic member candidates can be found in Makarov & Fabricius (2001), Torres et al (2000), and Tachihara et al (2003).…”

Section: Introduction: Flare Stars In Tw Hydraementioning

confidence: 99%

Flare stars in the TW Hydrae association: the HIP 57269 system

et al. 2003

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Abstract. We discuss a new member candidate of the TW Hydrae association (TWA) among the stars of the Gershberg et al. (1999) flare star catalog. TWA is one of the closest known associations of young stars at about 60 pc. Three supposedly young flare stars are located in the same region of the sky as TWA. One of them (HIP 57269) shows strong Lithium absorption with spectral type K1/K2V and a high level of chromospheric and coronal activity. It is located at a distance of 48.7 ± 6.3 pc in common with the five TWA members observed with Hipparcos (46.7 to 103.9 pc). HIP 57268 A has a wide companion C which also shows Lithium absorption at 6707Å and which has common proper motion with HIP 57269, as well as a close companion resolved visually by Tycho. HIP 57269 A&C lie above the main sequence and are clearly pre-main-sequence stars. The UVW-space velocity is more consistent with the star system being a Pleiades super cluster member. The two other flare stars in the TWA sky region do not show Lithium at all and are, hence, unrelated.

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X-ray and Molecular Emission from the Nearest Region of Recent Star Formation

Cited by 390 publications

References 19 publications

STIS Coronagraphic Imaging of the Herbig Ae Star: HD 163296

STIS Coronagraphic Imaging of the Herbig Ae Star: HD 163296

Near-Infrared Coronagraphic Imaging of the Circumstellar Disk around TW Hydrae

Flare stars in the TW Hydrae association: the HIP 57269 system

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