A New CCD Camera at the Molėtai Observatory

Zdanavicius, J.; Zdanavičius, K.

doi:10.1515/astro-2017-0099

Cited by 19 publications

(19 citation statements)

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“…By applying kinematical method to velocity profiles of the lines, Grenier et al (1989) estimated an approximate distances of 300 pc and 800 Recomputed Hipparcos distance of HD 200775 11 715±110 † Extinction vs distance 1 1. Zdanavičius et al (2009), 2. Straizys et al (1992), 3.…”

Section: Introductionmentioning

confidence: 99%

A census of young stellar population associated with the Herbig Be star HD 200775

Saha

Maheswar

Kamath

et al. 2020

Monthly Notices of the Royal Astronomical Society

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The region surrounding the well-known reflection nebula, NGC 7023, illuminated by a Herbig Be star, HD 200775, located in the dark cloud L1174 is studied in this work. Based on the distances and proper motion values from Gaia DR2 of 20 previously known young stellar object candidates, we obtained a distance of 335 ± 11 pc to the cloud complex L1172/1174. Using polarization measurements of the stars projected on the cloud complex, we show additional evidence for the cloud to be at ∼ 335 pc distance. Using this distance and proper motion values of the YSO candidates, we searched for additional comoving sources in the vicinity of HD 200775 and found 20 new sources which show low infrared excess emission and are of age ∼ 1 Myr. Among these, 10 YSO candidates and 4 newly identified comoving sources are found to show X-ray emission. Three of the four new sources for which we have obtained optical spectra show Hα in emission. About 80% of the total sources are found within ∼ 1 pc distance from HD 200775. Spatial correlation of some of the YSO candidates with the Herschel dust column density peaks suggests that star formation is still active in the region and may have been triggered by HD 200775.

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Section: Introductionmentioning

confidence: 99%

A census of young stellar population associated with the Herbig Be star HD 200775

Saha

Maheswar

Kamath

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…Photoelectric photometry of stars in the wide vicinity of Sh2-205 in the Vilnius seven-colour system has been started by Zdanavičius et al (2001) and Zdanavičius & Zdanavičius (2002) • , b = +0.21…”

Section: Introductionmentioning

confidence: 99%

Dark clouds in the vicinity of the emission nebula Sh2-205: interstellar extinction and distances

Straižys

Čepas

Boyle

et al. 2016

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Results of CCD photometry in the seven-colour Vilnius system for 922 stars down to V = 16-17 mag and for 302 stars down to 19.5 mag are used to investigate the interstellar extinction in an area of 1.5 square degrees in the direction of the P7 and P8 clumps of the dark cloud TGU H942, which lies in the vicinity of the emission nebula Sh2-205. In addition, we used 662 red clump giants that were identified by combining the 2MASS and WISE infrared surveys. The resulting plots of extinction versus distance were compared with previous results of the distribution and radial velocities of CO clouds and with dust maps in different passbands of the IRAS and WISE orbiting observatories. A possible distance of the front edge of the nearest cloud layer at 130 ± 10 pc was found. This dust layer probably covers all the investigated area, which results in extinction of up to 1.8 mag in some directions. A second rise of the extinction seems to be present at 500-600 pc. Within this layer, the clumps P7 and P8 of the dust cloud TGU H942, the Sh2-205 emission nebula, and the infrared cluster FSR 655 are probably located. In the direction of these clouds, we identified 88 young stellar objects and a new infrared cluster.

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“…In several directions of the Camelopardalis dark clouds, the interstellar extinction was investigated by Zdanavičius et al (1996Zdanavičius et al ( , 2001, Zdanavičius & Zdanavičius (2002a,b, 2005 using seven-colour photometry in the Vilnius system and photometric classification of stars in spectral and luminosity classes. A common property of all areas is the extinction rise at 120-150 pc, reaching A V about 1.5-2.5 mag at 1 kpc.…”

Section: Introductionmentioning

confidence: 99%

The dark cloud TGU H994 P1 (LDN 1399, LDN 1400, and LDN 1402): Interstellar extinction and distance

Straižys

Čepas

Boyle

et al. 2015

A&A

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The results of CCD photometry in the seven-colour Vilnius system, for about 1000 stars down to V = 20 mag and their twodimensional spectral types, are used to investigate the interstellar extinction in a 1.5 square degree area in the direction of the dark cloud TGU H994 P1 (LDN 1399, LDN 1400 and LDN 1402) in Camelopardalis. Photometric classification of 18 brightest stars down to V = 12 mag was verified by the spectra obtained with the 1.22 m telescope of the Asiago Observatory. The interstellar extinction run with distance is investigated with the results of photometry in the Vilnius system, and 504 red clump giants, identified by combining the results of infrared photometry from the 2MASS and WISE surveys. A possible distance of 140 ± 11 pc to the TGU H994 P1 cloud seems to be acceptable. Alternative distances of the cloud are discussed. The complex of the Camelopardalis clouds probably has a considerable depth along the line of sight, similar to that observed in the Taurus-Auriga complex. The maximum extinction A V in the dark filaments is found to be about 6.5 mag.

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A New CCD Camera at the Molėtai Observatory

Abstract: The results of the first testing of a new CCD camera of the Molėtai Observatory are given. The linearity and the flat field corrections of good accuracy are determined by using shifted star field exposures.

Cited by 19 publications

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A census of young stellar population associated with the Herbig Be star HD 200775

A census of young stellar population associated with the Herbig Be star HD 200775

Dark clouds in the vicinity of the emission nebula Sh2-205: interstellar extinction and distances

The dark cloud TGU H994 P1 (LDN 1399, LDN 1400, and LDN 1402): Interstellar extinction and distance

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