Close binary companions of the HAeBe stars LkH<i>α</i>198, Elias 1, HK Ori and V380 Ori

Smith, K. W.; Balega, Y. Y.; Duschl, W. J.; Hofmann, K.-H.; Lachaume, R.; Preibisch, Thomas; Schertl, D.; Weigelt, G.

doi:10.1051/0004-6361:20041135

Cited by 51 publications

(49 citation statements)

References 50 publications

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“…There are however remarkable exceptions to this general rule. For instance, both the outflow and the binary orbit of the LkHα 198 system lie close to the plane of the sky, indicating that the circumstellar disk is nearly orthogonal to the binary orbit (Smith et al 2005). A strong argument can also be made in the PDS 144 system, where one of the two components has its disk viewed almost exactly edge-on while the other lies at a lower inclination, indicating that the two disks are misaligned by about 25…”

Section: Circumstellar Disks In Wide Binariesmentioning

confidence: 97%

Herbig AeBe stars: multiplicity and consequences

Duchêne¹

2014

Astrophys Space Sci

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By virtue of their young age and intermediate mass, Herbig AeBe stars represent a cornerstone for our understanding of the mass-dependency of both the stellar and planetary formation processes. In this contribution, I review the current state-of-the-art multiplicity surveys of Herbig AeBe stars to assess both the overall frequency of companions and the distribution of key orbital parameters (separation, mass ratio and eccentricity). In a second part, I focus on the interplay between the multiplicity of Herbig AeBe stars and the presence and properties of their protoplanetary disks. Overall, it appears that both star and planet formation in the context of intermediate-mass stars proceeds following similar mechanisms as lower-mass stars.

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Section: Circumstellar Disks In Wide Binariesmentioning

confidence: 97%

Herbig AeBe stars: multiplicity and consequences

Duchêne¹

2014

Astrophys Space Sci

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“…Next to the primary of spectral type B9...A6 the system includes a T Tauri type companion at a separation of ∼4 (Leinert et al 1997). Smith et al (2005) discovered a further faint companion with estimated mass of 1.5−2 M at only 50 mas from the HAeBe star.…”

Section: A2 V892 Taumentioning

confidence: 99%

“…A few studies have focused on a search for close visual binaries (e.g. Li et al 1994;Pirzkal et al 1997;Leinert et al 1997;Smith et al 2005). Monte Carlo simulations by Pirzkal et al (1997) have suggested that almost all HAeBe stars have companions within a completeness limit of K < 10.5 mag for separations of 0.4...8 .…”

Section: Introductionmentioning

confidence: 99%

On the origin of the X-ray emission from Herbig Ae/Be stars

Stelzer

Micela

Hamaguchi

et al. 2006

A&A

100

107

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Context. Herbig Ae/Be stars are fully radiative and not expected to support dynamo action analogous to their convective lower-mass counterparts, the T Tauri stars. Alternative X-ray production mechanisms, related to stellar winds or star-disk magnetospheres have been proposed, but their X-ray emission has remained a mystery. Aims. A study of Herbig Ae/Be stars' global X-ray properties (such as detection rate, luminosity, temperature, variability), helps to constrain the emission mechanism by comparison to other types of stars, e.g. similar-age but lower-mass T Tauri stars, similar-mass but more evolved main-sequence A-and B-type stars, and with respect to model predictions. Methods. We performed a systematic search for Chandra archival observations of Herbig Ae/Be stars. The superior spatial resolution of this satellite with respect to previous X-ray instrumentation has allowed us to also examine the possible role of late-type companions in generating the observed X-rays. Results. In the total sample of 17 Herbig Ae/Be stars, 8 are resolved from X-ray emitting faint companions or other unrelated X-ray bright objects within 10 . The detection fraction of Herbig Ae/Be stars is 76%, but decreases to 35% if all emission is attributed to further known and unresolved companions. The spectral analysis confirms the high X-ray temperatures (∼20 MK) and large range of fractional X-ray luminosities (log L x /L * ) of this class derived from earlier studies of individual objects. Conclusions. Radiative winds are ruled out as an emission mechanism on the basis of the high temperatures. The X-ray properties of Herbig Ae/Be stars are not vastly different from those of their late-type companion stars (if such are known), nor from other young late-type stars used for comparison. Therefore, either a similar kind of process takes place in both classes of objects, or there must be as yet undiscovered companion stars.

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“…Rebull et al (2010) report it as a flat-spectrum source in the near-to-far-IR, having L IR /L total = 0.089. V892 Tau is a double-star system (Smith et al 2005) with a circumbinary disk (Monnier et al 2008).…”

Section: V892 Taumentioning

confidence: 99%

B- And a-Type Stars in the Taurus-Auriga Star-Forming Region

Mooley

Hillenbrand

Rebull

et al. 2013

ApJ

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We describe the results of a search for early-type stars associated with the Taurus-Auriga molecular cloud complex, a diffuse nearby star-forming region noted as lacking young stars of intermediate and high mass. We investigate several sets of possible O, B, and early A spectral class members. The first is a group of stars for which mid-infrared images show bright nebulae, all of which can be associated with stars of spectral-type B. The second group consists of early-type stars compiled from (1) literature listings in SIMBAD, (2) B stars with infrared excesses selected from the Spitzer Space Telescope survey of the Taurus cloud, (3) magnitude-and color-selected point sources from the Two Micron All Sky Survey, and (4) spectroscopically identified early-type stars from the Sloan Digital Sky Survey coverage of the Taurus region. We evaluated stars for membership in the Taurus-Auriga star formation region based on criteria involving: spectroscopic and parallactic distances, proper motions and radial velocities, and infrared excesses or line emission indicative of stellar youth. For selected objects, we also model the scattered and emitted radiation from reflection nebulosity and compare the results with the observed spectral energy distributions to further test the plausibility of physical association of the B stars with the Taurus cloud. This investigation newly identifies as probable Taurus members three B-type stars: HR 1445 (HD 28929), τ Tau (HD 29763), 72 Tau (HD 28149), and two A-type stars: HD 31305 and HD 26212, thus doubling the number of stars A5 or earlier associated with the Taurus clouds. Several additional early-type sources including HD 29659 and HD 283815 meet some, but not all, of the membership criteria and therefore are plausible, though not secure, members.

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Close binary companions of the HAeBe stars LkHα198, Elias 1, HK Ori and V380 Ori

Cited by 51 publications

References 50 publications

Herbig AeBe stars: multiplicity and consequences

Herbig AeBe stars: multiplicity and consequences

On the origin of the X-ray emission from Herbig Ae/Be stars

B- And a-Type Stars in the Taurus-Auriga Star-Forming Region

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