Astronomy at the Vilnius University

Sudzius, J.

doi:10.1515/astro-1994-1-204

Cited by 10 publications

(10 citation statements)

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“…The uvby data were used to derive the reddening E bϪy , effective temperature, and metallicity as described in Suchkov & McMaster (1999) and Suchkov (2001), based on the algorithm in Moon (1985) as well as the Schuster & Nissen (1989) Straižis (1977), Crawford (1975aCrawford ( , 1975b, and Sudžius (1974). The absolute magnitude was computed from the V magnitude, corrected for extinction, using the Hipparcos parallax; V magnitudes were taken from the Hipparcos catalog.…”

Section: Datamentioning

confidence: 99%

Candidate Pre–Main-Sequence F Stars with Circumstellar Dust Identified Using Combined 2MASS and [CLC][ITAL]uvby[/ITAL][/CLC] Data

Suchkov¹,

Schultz²,

Lisse³

2002

The Astrophysical Journal

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We propose a method that uses near-infrared plus uvby photometry to identify potentially extensive circumstellar dusty environments around F and A stars. The method has been applied to a sample of ∼900 metal-rich reddened F stars with 2 Micron All Sky Survey and uvby data, suggesting the presence of circumstellar dust emitting in the near-infrared for ∼70 stars. The diagram suggests that most, if not all, are likely pre-main-sequence log T -M e V (PMS) stars. They seem to be a continuation of the class of Herbig Ae/Be PMS stars in the spectral type F. Their number drops sharply downward of (spectral types later than ∼F5), which may provide new log T ∼ 3.84 e clues to the PMS evolution of 1-2 M , stars. We present a list of 21 of the most conspicuous candidate stars with circumstellar dust. About half of them are associated with the extended star-forming region around r Ophiuchi. The brightest of these 21 stars, with , turn out to be IRAS sources, suggesting the presence of heated V Շ 7.5 dust emitting in the far-infrared. Also in this list, HD 81270 is reported as a very unusual star moving away from the Galactic plane at a projected speed of 70 km s Ϫ1 .

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Section: Datamentioning

confidence: 99%

Candidate Pre–Main-Sequence F Stars with Circumstellar Dust Identified Using Combined 2MASS and [CLC][ITAL]uvby[/ITAL][/CLC] Data

Suchkov¹,

Schultz²,

Lisse³

2002

The Astrophysical Journal

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“…The results are given in Table 4. The other lines in Table 4 give colorexcess ratios from Sudzius (1974) The overall majority of the stars used for the extinction law determination (14 from 15) are situated at distances 450-900 pc (Straizys et al 1989a(Straizys et al , 1993, i.e., most of them should belong to the North America and Pelican nebulae complex. Consequently, they should be reddened predominantly by the dark cloud at the distance of the nebulae, at 580±100 pc (Straizys et al 1993).…”

Section: Extinction Law Determinationmentioning

confidence: 99%

Interstellar extinction law in the vicinity of the North America and Pelican nebulae

Corbally¹,

Straižys²,

Laugalys³

1999

Open Astronomy

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Abstract. The interstellar reddening law is derived for 15 heavily reddened stars in the area which includes the North America and Pelican nebulae and the dark cloud between them. The method is based on photometry of these stars in the Vilnius seven-color system and on their MK spectral types. The mean law in this area is very similar to the law for a much wider area in Cygnus derived earlier by other authors. It differs from the normal law by exhibiting somewhat stronger extinction in the violet and the near ultraviolet spectral region, i.e., it shows a smaller "knee" in the blue part of the spectrum.

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“…by Straizys (1963aStraizys ( ,d,f, 1965aStraizys ( , 1977Straizys ( , 1992, Azusienis & Straizys (1964a, 1966c, 1967a, 1969a, Südzius (1974), Straizys, Südzius & Kuriliené (1976). Investigations by other authors on the same matter are reviewed in my monographs (Straizys 1977(Straizys , 1992.…”

Section: Av/eb-vmentioning

confidence: 99%

The method of synthetic photometry

Straižys¹

1996

Open Astronomy

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Abstract. The method of synthetic photometry, using the calculation of magnitudes, color indices and other photometric quantities of stars from their spectral energy distribution functions, is being used for obtaining the transformation relations between various photometric systems, the selection of optimum positions of passbands for stellar classification, for investigation of interstellar and atmospheric extinction effects (the band-width effect), for restoration of response functions of the photometric system, for calibrations of photometric quantities in terms of physical parameters of stars, for calibration of magnitudes in absolute fluxes and many other tasks. The paper describes the history of the method and its different applications.

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Astronomy at the Vilnius University

Cited by 10 publications

References 0 publications

Candidate Pre–Main-Sequence F Stars with Circumstellar Dust Identified Using Combined 2MASS and [CLC][ITAL]uvby[/ITAL][/CLC] Data

Candidate Pre–Main-Sequence F Stars with Circumstellar Dust Identified Using Combined 2MASS and [CLC][ITAL]uvby[/ITAL][/CLC] Data

Interstellar extinction law in the vicinity of the North America and Pelican nebulae

The method of synthetic photometry

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