SIMBAD references

2002AJ....123.2597O - Astron. J., 123, 2597-2626 (2002/May-0)

Hα emission stars and Herbig-Haro objects in the vicinity of bright-rimmed clouds.


Abstract (from CDS):

Bright-rimmed clouds (BRCs) found in H II regions are probably sites of triggered star formation due to compression by ionization/shock fronts. Many BRCs harbor IRAS point sources of low dust temperature. They also frequently contain a small cluster of near-IR stars that is elongated along the axis of the BRC. Here we present the results of our Hα grism spectroscopy and narrowband imaging observations of BRCs in search of candidate pre-main-sequence stars of the T Tauri, Herbig Ae/Be and related types, and Herbig-Haro (HH) objects. We have detected a large number (460) of Hα emission stars down to a limiting magnitude of about R=20 in and around all but two of the 28 BRCs observed. The present study has, for the first time, reached down nearly to the faintest classical T Tauri star population in OB associations. A total of 12 new HH objects have been found. Most are of small apparent size, emphasizing the need for deep searches at high spatial resolution, but HH 588 associated with BRC 37 represents a huge HH complex composed of two-staged bow shocks on both sides of a tiny central knot. These stars and HH objects are concentrated near the tip of bright rims (i.e., in the head of the BRCs and just outside the rims) and often make loose aggregates similar to those of near-IR stars, thus supporting our hypothesis of ``small-scale sequential star formation.'' The presence of such a large number of Hα emission stars in the immediate vicinities of BRCs implies that second-generation formation of low-mass stars is relatively extensive and further supports the notion of cohabitation of high- and low-mass populations in OB associations.

Abstract Copyright:

Journal keyword(s): ISM: H II Regions - ISM: Globules - ISM: Herbig-Haro Objects - Stars: Formation - Stars: Pre-Main-Sequence

VizieR on-line data: <Available at CDS (J/AJ/123/2597): table4.dat table5.dat table7.dat>

Nomenclature: Table 5: [OSP2002] BRC NN NN, [OSP2002] BRC NNWW NN, N=416, [OSP2002] S140 N (Nos 1-8), [OSP2002] Cep B NN (Nos 1-33), [OSP2002] LW Cas NN (Nos 1-12), [OSP2002] OriI-2N N (Nos 1-4). Table 7: HH NNNWWNA (Nos 588NE1A to 588NE1E, 588NE2A to 588NE2E, 588SW1A to 588SW1C, 588SW2A to 588SW2D).

CDS comments: BRC NN objetcs are SFO NN in Simbad. BRC 11NE and 11E are NAME SFO 11NE and 11E. In table 5 the list of sources in SFO 13 is identical to the list in SFO 12. See real list in SFO 13 in 2008AJ....135.2323I.

Simbad objects: 593

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