Stellar photometry with the Carte du Ciel plates

Lamareille, F.; Thiévin, Jonathan; Fournis, B.; Grimault, P.; Broquet, L.; Davoust, E.

doi:10.1051/0004-6361:20030246

Cited by 11 publications

(8 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, one can look at the differences in the m b magnitudes derived from each of the three 30-min exposures on the same plate. The rms scatter σ 1 generally can be taken as the internal photometric error for the plate, which we will show is about 0.45 ± 0.10 mag identical to the internal error of similar photographic observations (Ortiz-Gil et al 1998;Lamareille et al 2003). Larger scatter may indicate rapid blue-light variability, which we will call flickering.…”

Section: General Characteristics Of the Sydney Observatory Galactic Ssupporting

confidence: 60%

A variability sample catalogue selected from the Sydney Observatory Galactic Survey

Fresneau

Osborn²

2009

A&A

View full text Add to dashboard Cite

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.

show abstract

Section: General Characteristics Of the Sydney Observatory Galactic Ssupporting

confidence: 60%

A variability sample catalogue selected from the Sydney Observatory Galactic Survey

Fresneau

Osborn²

2009

A&A

View full text Add to dashboard Cite

show abstract

“…Photographic magnitudes of stars on CduC plates have been obtained by Ortiz-Gil et al (1998) with an accuracy of 0.09 mag, by Lamareille et al (2003) with an accuracy of ∼0.2-0.4 mag, and by Rapaport et al (2006) with an accuracy of 0.6 mag. We obtain similar photometric accuracy, 0.28 mag and 0.24 mag for single-and triple-exposure plates, respectively.…”

Section: Comparison With Other Cduc Catalogsmentioning

confidence: 99%

Digitization and astrometric calibration of Carte du Ciel photographic plates with Gaia DR1

Lehtinen

Prusti

Bruijne

et al. 2018

A&A

View full text Add to dashboard Cite

Context. Carte du Ciel was a global international project at the end of the nineteenth and beginning of the twentieth century to map the sky to about magnitude 14 on photographic plates. The full project was never observationally completed and a large fraction of the observations made remain unanalyzed. Aims. We want to study whether the astrometric and photometric accuracies obtained for the Carte du Ciel plates digitized with a commercial digital camera are high enough for scientific exploitation of the plates. Methods. We use a digital camera Canon EOS 5Ds, with a 100 mm macrolens for digitizing. We analyze six single-exposure plates and four triple-exposure plates from the Helsinki zone of Carte du Ciel (+39 • ≤ δ ≤ +47 • ). Each plate is digitized using four images, with a significant central area being covered twice for quality control purposes. The astrometric calibration of the digitized images is done with the data from the Gaia TGAS (Tycho-Gaia Astrometric Solution) of the first Gaia data release (Gaia DR1), Tycho-2, HSOY (Hot Stuff for One Year), UCAC5 (USNO CCD Astrograph Catalog), and PMA catalogs. Results. The best astrometric accuracy is obtained with the UCAC5 reference stars. The astrometric accuracy for single-exposure plates is σ(α cos(δ)) = 0.16 and σ(δ) = 0.15 , expressed as a Gaussian deviation of the astrometric residuals. For triple-exposure plates the astrometric accuracy is σ(α cos(δ)) = 0.12 and σ(δ) = 0.13 . The 1-σ uncertainty of photometric calibration is about 0.28 mag and 0.24 mag for single-and triple-exposure plates, respectively. We detect the photographic adjacency (Kostinsky) effect in the triple-exposure plates.Conclusions. We show that accuracies at least of the level of scanning machines can be achieved with a digital camera, without any corrections for possible distortions caused by our instrumental setup. This method can be used to rapidly and inexpensively digitize and calibrate old photographic plates enabling their scientific exploitation.

show abstract

“…The plates are considered to be reasonable firstepoch material for astrometric studies. That was the reason for the digitization of such plate collections in the observatories in Sydney (Fresneau et al 2001(Fresneau et al , 2003(Fresneau et al , 2005(Fresneau et al , 2007, Toulouse (Lamareille et al 2003), Cordoba (Bustos Fierro & Calderon 2003;Calderon et al 2004), Bordeaux Rapaport et al 2006), Uccle (Tsvetkova et al 2007), and San Fernando (Vicente et al 2007). In order to enable the present and future use of the CdC plates we undertook an inventory of the Potsdam…”

Section: Introductionmentioning

confidence: 99%

The Potsdam plates of the Carte du Ciel project: I. Present inventory and plate catalogue

et al. 2009

View full text Add to dashboard Cite

We present an inventory ofthe Carte du Ciel (CdC) plates stored in the Astrophysical Institute Potsdam. The Potsdam CdC zone (+32° to +39°) was divided into 1232 areas and about 2200 plates from the first and second epochs were obtained within the framework of the CdC project. At present, only 977 plates (45% of all) are stored in AIP, the others got lost during the Second World War. The plates for the first epoch measurements had been obtained during the period 1893 May– 1900 February. The plates for the second epoch (1913 August–1924 February) can be separated into two time intervals according to the observer and the observing method used: from 1913 August till 1914 July, and from 1916 February to 1924 February. The present work aims to provide online access to the plate information, given in the plate catalogue and is the first step to online access to the plate images digitized with flatbed scanners.

show abstract

Stellar photometry with the Carte du Ciel plates

Cited by 11 publications

References 11 publications

A variability sample catalogue selected from the Sydney Observatory Galactic Survey

A variability sample catalogue selected from the Sydney Observatory Galactic Survey

Digitization and astrometric calibration of Carte du Ciel photographic plates with Gaia DR1

The Potsdam plates of the Carte du Ciel project: I. Present inventory and plate catalogue

Contact Info

Product

Resources

About