A variability sample catalogue selected from the Sydney Observatory Galactic Survey

Abstract

Context. A set of 55 × 10 3 stars brighter than about B-magnitude 14 and having at least three observations are identified in the Sydney Observatory Galactic Survey, carried out over the years 1892-1932 along the galactic equator section l ∈ [275. Short-term (30 min) and long-term (decades) magnitude variations in the data set are analyzed. Aims. Evidence is sought for a correlation between short-term and long-term variabilities which would identify stars in a non-quiescent phase. Methods. We use a reduced proper motion diagram to classify the stars in our sample into probable dwarfs, giants and other types. The validity of the kinematical classification is checked using objective-prism spectroscopic classification for 10 × 10 3 early-type stars. A search is made for statistical correlations between our variability indicators and physical and kinematical stellar properties. Results. We find that suspected photospheric activity for giant and dwarf stellar candidates is correlated with the time to cross the galactic thin disk. We estimate a significant apparent B-magnitude variation of ±0.25 over the 40 years of photographic observations, and candidates for monitoring for possible photospheric activity at the present time are selected employing a statistical colour-diagram which uses the total proper motion component as a distance indicator. Conclusions. Follow up studies of our tentative findings are suggested. Toward this aim the derived data for the set of 55 × 10 3 stars with variability information is archived as the variability Sample Catalogue. The data for a set of 2.4 × 10 5 stars along the section of the galactic equator l ∈ [275 • , 335 • ], |b| ≤ 7 • , and a set of of 1.7 × 10 5 stars along the section of the galactic meridian 330 • ± 5 • , b ∈ [−64 • , −7 • ] is also archived as a quick-look facility for seeking long-term magnitude changes since the century-old photographic observations were obtained.

On the Mass Accretion Rate and Infrared Excess in Herbig Ae/Be Stars

“…The V magnitudes of 101 HAeBe stars are compiled from AAVSO Photometric All Sky Survey (APASS; Henden et al 2016) and Tycho-2 (Høg et al 2000) catalogues. The remaining 5 stars which had no V magnitude listed in both the catalogues are taken from the following references − Herbst & Shevchenko (1999), Getman et al (2008), Fresneau & Osborn (2009) and Girard et al (2011).…”

Astronomical photographic data archives: Recent status

“…There are/were also other major digitization efforts with no (or not publicly known and available) pipeline: (a) China 29,000 plates, data delivered to the Chinese VO (Yu et al ); (b) Sonneberg 250,000 plates (Hippke et al ; Kroll ); (c) high‐quality super‐precise plate digitizer developed and installed at the ROB Brussel some 10 years ago but no details available about number of plates digitized; (d) the Heidelberg online plate archive of over 11,000 plate scans (https://www.lsw.uni-heidelberg.de/projects/scanproject/) with query tool (http://dc.zah.uni-heidelberg.de/lswscans/res/positions/q/form); (e) the online catalogue (but no images) from measures of the Sydney Observatory Astrographic Catalog (CdC) plates (2 million stars; see the 2007–2009 papers and catalogues listed for A. Fresneau and collaborators in ADS, (Fresneau & Osborn ); and (f) a large Italian plate scanning project led by Prof. Cesare Barbieri (Barbieri et al ) was interrupted and closed with, to our knowledge, a rather limited number of plates digitized (mostly at Asiago) due to the project closure.…”