Investigations of Stephenson's H<i>α</i> stars

Emprechtinger, M.; Kimeswenger, S.; Kronberger, T.; Mair, M.; Weratschnig, J.

doi:10.1002/asna.200410352

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…A total of 206 candidates were identified on a series of ≈1300 5.2 × 5.2 degree red-sensitive objective prism plates acquired at a dispersion of 1000 Å/mm and a limiting magnitude ∼13. Subsequent spectroscopic follow-ups (Downes & Keyes 1988;Weaver & Hobson 1988;Maheswar, Manoj, & Bhatt 2003;Emprechtinger et al 2005) of the resultant catalog [StHA] have identified several T Tauri stars including a handful at high Galactic latitude such as StHA 18 in MBM 12. Kun (1992) conducted a deeper objective prism survey (to V ∼ 16) with the Schmidt telescope of Konkoly Observatory covering the MBM 23-44, 49, 50, 53, 54 and 55 molecular clouds which resulted in 100 candidate Hα emission-line stars.…”

Section: Hα Surveysmentioning

confidence: 99%

Star Formation and Molecular Clouds at High Galactic Latitude

McGehee

2008

Preprint

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In this chapter we review the young stars and molecular clouds found at high Galactic latitudes (|b| ≥ 30 • ). These are mostly associated with two largescale structures on the sky, the Gould Belt and the Taurus star formation region, and a handful of molecular clouds including MBM 12 and MBM 20 which, as a population, consist of the nearest star formation sites to our Sun. There are also a few young stars that are found in apparent isolation far from any molecular cloud. The high latitude clouds are primarily translucent molecular clouds and diffuse Galactic cirrus with the majority of them seen at high latitude simply due to their proximity to the Sun. The rare exceptions are those, like the Draco and other intermediate or high velocity clouds, found significantly above or below the Galactic plane. We review the processes that result in star formation within these low density and extraplanar environments as well as the mechanisms for production of isolated T Tauri stars. We present and discuss the known high-latitude stellar nurseries and young stellar objects.

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Section: Hα Surveysmentioning

confidence: 99%

Star Formation and Molecular Clouds at High Galactic Latitude

McGehee

2008

Preprint

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Imaging the transition between pre-planetary and planetary nebulae: integral field spectroscopy of hot post-AGB stars with NIFS

Gledhill

Forde

2014

Monthly Notices of the Royal Astronomical Society

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We present 2-2.4 µm integral field spectroscopy of a sample of hot post-AGB stars with early-B spectral types, using the NIFS instrument on Gemini North. These stars are just beginning to ionize their immediate environments and turn into planetary nebulae (PNe). We use molecular hydrogen emission lines together with hydrogen and helium recombination lines to explore the distribution of molecular and atomic gas and the extent of the developing ionized region. We see a range of evolutionary stages: IRAS 18062+2410 and IRAS 18379-1707 have recently developed compact and unresolved regions of photoionized H within axisymmetric molecular envelopes, with the former object increasing its Brγ flux by a factor of 5.3 in 14 years; IRAS 22023+5249 and IRAS 20462+3416 have extended Brγ nebulae and in the latter object only weak H 2 emission remains; IRAS 19336-0400 is at a more advanced stage of PN formation where H 2 is mostly dissociated and we see structure in both the H and He recombination line nebulae. IRAS 19200+3457 is the only object not to show the He I line at 2.058 µm and is probably the least evolved object in our sample; the H 2 emission forms a ring around the star and we suggest that this object may be a rare example of a "round" pre-PN in transition to a "round" PN.

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Analysis of Gaia DR3 Data of Selected High Galactic Latitude Hα Emission Stars

Parthasarathy

2024

Res. Notes AAS

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Gaia DR3 data of 52 high galactic latitude Hα emission stars selected from the paper of Stephenson are analyzed. Ten new variable stars and eight new high velocity stars have been found. Details of six post-AGB stars and several other interesting stars are discussed. Many of the stars presented in this paper have Gaia DR3 light curves and spectra. A detailed study of these 52 stars is needed to derive their chemical composition and to further understand their binarity, circumstellar matter and evolutionary status. The astrophysical parameters from the Gaia DR3 data reveal several hot (OBA) and several F and G-type stars in this sample. Some of them are metal-poor stars.

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Investigations of Stephenson's Hα stars

Cited by 3 publications

References 7 publications

Star Formation and Molecular Clouds at High Galactic Latitude

Star Formation and Molecular Clouds at High Galactic Latitude

Imaging the transition between pre-planetary and planetary nebulae: integral field spectroscopy of hot post-AGB stars with NIFS

Analysis of Gaia DR3 Data of Selected High Galactic Latitude Hα Emission Stars

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