CCD photometry of some areas around the open cluster M45
We present the results of photometric studies in some areas around the open star cluster M 45. Observations were carried out on January-March 2012. About 600 images were obtained in the V band (Johnsons system). Centres of the observed areas correspond to the maximum concentration of stars with the...
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Головна астрономічна обсерваторія НАН України
2012
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| Цитувати: | CCD photometry of some areas around the open cluster M45 / A.A. Savushkin, A.A. Shlyapnikov // Advances in Astronomy and Space Physics. — 2012. — Т. 2., вип. 2. — С. 191-193. — Бібліогр.: 8 назв. — англ. |
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irk-123456789-1193992017-06-07T03:04:48Z CCD photometry of some areas around the open cluster M45 Savushkin, A.A. Shlyapnikov, A.A. We present the results of photometric studies in some areas around the open star cluster M 45. Observations were carried out on January-March 2012. About 600 images were obtained in the V band (Johnsons system). Centres of the observed areas correspond to the maximum concentration of stars with the solar-type activity. Using the V-band magnitude values from the GTSh10 catalogue we analysed the flare activity of the stars. The catalogue of observations with the shared access through the Aladin interface was compiled. 2012 Article CCD photometry of some areas around the open cluster M45 / A.A. Savushkin, A.A. Shlyapnikov // Advances in Astronomy and Space Physics. — 2012. — Т. 2., вип. 2. — С. 191-193. — Бібліогр.: 8 назв. — англ. 2227-1481 http://dspace.nbuv.gov.ua/handle/123456789/119399 en Advances in Astronomy and Space Physics Головна астрономічна обсерваторія НАН України |
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English |
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We present the results of photometric studies in some areas around the open star cluster M 45. Observations were carried out on January-March 2012. About 600 images were obtained in the V band (Johnsons system). Centres of the observed areas correspond to the maximum concentration of stars with the solar-type activity. Using the V-band magnitude values from the GTSh10 catalogue we analysed the flare activity of the stars. The catalogue of observations with the shared access through the Aladin interface was compiled. |
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Article |
| author |
Savushkin, A.A. Shlyapnikov, A.A. |
| spellingShingle |
Savushkin, A.A. Shlyapnikov, A.A. CCD photometry of some areas around the open cluster M45 Advances in Astronomy and Space Physics |
| author_facet |
Savushkin, A.A. Shlyapnikov, A.A. |
| author_sort |
Savushkin, A.A. |
| title |
CCD photometry of some areas around the open cluster M45 |
| title_short |
CCD photometry of some areas around the open cluster M45 |
| title_full |
CCD photometry of some areas around the open cluster M45 |
| title_fullStr |
CCD photometry of some areas around the open cluster M45 |
| title_full_unstemmed |
CCD photometry of some areas around the open cluster M45 |
| title_sort |
ccd photometry of some areas around the open cluster m45 |
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Головна астрономічна обсерваторія НАН України |
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2012 |
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http://dspace.nbuv.gov.ua/handle/123456789/119399 |
| citation_txt |
CCD photometry of some areas around the open cluster M45 / A.A. Savushkin, A.A. Shlyapnikov // Advances in Astronomy and Space Physics. — 2012. — Т. 2., вип. 2. — С. 191-193. — Бібліогр.: 8 назв. — англ. |
| series |
Advances in Astronomy and Space Physics |
| work_keys_str_mv |
AT savushkinaa ccdphotometryofsomeareasaroundtheopenclusterm45 AT shlyapnikovaa ccdphotometryofsomeareasaroundtheopenclusterm45 |
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2025-07-08T15:48:21Z |
| last_indexed |
2025-07-08T15:48:21Z |
| _version_ |
1837094356872331264 |
| fulltext |
CCD photometry of some areas around the open cluster M45
A.A. Savushkin∗, A.A. Shlyapnikov†
Advances in Astronomy and Space Physics, 2, 191-193 (2012)
© A.A. Savushkin, A.A. Shlyapnikov, 2012
Scienti�c Research Institute Crimean Astrophysical Observatory, 98409 Nauchny, Crimea, Ukraine
We present the results of photometric studies in some areas around the open star cluster M45. Observations
were carried out on January�March 2012. About 600 images were obtained in the V band (Johnsons system).
Centres of the observed areas correspond to the maximum concentration of stars with the solar-type activity. Using
the V-band magnitude values from the GTSh10 catalogue we analysed the �are activity of the stars. The catalogue
of observations with the shared access through the Aladin interface was compiled.
Key words: techniques: photometric, stars: variables: general, catalogues
introduction
The open cluster M45, Pleiades, with RA=
03h47m00s, Dec= +24◦07′00′′ (2000), is located in
Taurus and includes more than 3000 stars. The �rst
�are star in this cluster was found in 1958 by John-
son and Mitchell [5]. It was a solar-type star. Dur-
ing compilation of catalogue of stars with the solar-
type activity, GTSh10 [4], it was found that the V-
magnitude of some stars is unknown. We tried to �ll
this gap and observed some selected areas around the
M45 cluster with the MTO-10001 objective mounted
on the RC-800 telescope [2].
observations and data processing
All observations were carried out on January�
March 2012 with the MTO-1000 objective and the
QHY62 CCD camera at the Crimean Astrophysi-
cal Observatory. The objective MTO-1000 has the
focal length of 1000mm and the relative aperture
1:10. The CCD camera QHY6 has highly sensitive
monochromatic matrix with the pixel size 6.5µm ×
6.25µm and the quantum yield of 65% at 5800Å.
The �eld of view is 18′× 14′ or 752× 582 pixels with
the resolution of 1.5′′/pix. Centres of CCD frames
for MTO-1000 were selected by means of the Aladin
sky atlas � the on-line application based on the
VizieR database [1]. An auxiliary Javascript mod-
ule (AJS) has been created for this purpose. Fig. 1
shows the map of coverage in the Aladin interface
window. About 600 images were obtained in the V-
band (Johnsons system). Positions of centres of the
observed areas correspond to the maximum concen-
tration of stars with the solar-type activity.
List of the observed areas along with the their
centres' coordinates, start and end moments of ob-
servations, and the number of obtained images are
presented in Table 1.
The database of CCD images has been created
in VOTable format in order to be incorporated into
VizieR with the access through the Aladin [1]. The
access to individual observations and summarised
images is provided via XML script (Fig. 1, a hyper-
link at the bottom of the picture).
Fig. 1: Map of investigated areas.
In Fig. 2 the dependence of the instrumental mag-
nitudes on those values from NOMAD catalogue is
presented, N indicates the number of objects in se-
lected area, R is the correlation coe�cient, and σ̄
is the residual mean square error. The range of
brightness variation for stars with the solar-type ac-
tivity was estimated from GTSh10 and NOMAD cat-
alogues.
In Fig. 3 we present an example of the origi-
nal image obtained on MTO-1000. The sample
of stars was selected from the GTSh10 catalogue.
∗sharrakka@mail.ru
†aas@crao.crimea.ua
1http://www.zenitcamera.com/archive/lenses/mto-1000.html
2http://qhyccd.com/QHY6.html
191
Advances in Astronomy and Space Physics A.A. Savushkin, A.A. Shlyapnikov
Table 1: Log of observations.
Area number Coordinates of the centre Start (JD) End (JD) Nobs
M45_1 03h42m51s.67 +24�41�37�.7 2455966.19896 2455966.21725 22
M45_2 03 43 35.28 +24 59 38.9 2455966.23070 2455966.25111 20
M45_3 03 47 02.20 +24 23 03.2 2455964.29582 2455966.31449 53
M45_4 03 47 51.50 +24 47 30.6 2456005.28236 2456005.30501 29
M45_5 03 47 50.05 +24 25 44.7 2456005.23534 2456006.23925 60
M45_6 03 49 12.37 +24 32 35.5 2456006.24281 2456006.26320 28
M45_7 03 51 39.29 +24 17 09.3 2456004.33358 2456007.33650 60
M45_8 03 51 41.39 +23 52 43.2 2456004.29780 2456007.30538 55
M45_9 03 50 03.19 +23 55 48.5 2455964.23651 2456007.27916 92
M45_10 03 47 47.43 +23 41 27.9 2455964.20832 2456007.24833 150
Table 2: Partial data of the �nal catalogue (M45_1 area).
α (2000.0) δ (2000.0) m1obs m2cat m2-m1 Name of GTSh10 Type VSXmax VSXmin P
(h m s) (◦ ′ ′′) (m) (m) (m) star number (m) (m)
03 42 21.57 +24 39 51.1 13.84 13.99 0.15 V500 Tau 816 Fl 14.300 15.900 B
03 42 38.05 +24 41 19.4 15.35 15.07 -0.28 LP Tau 827 Fl 16.200 17.000 U
03 42 52.17 +24 42 06.9 13.49 - - V1033 Tau 835 Fl 13.000 < 18.000 U
03 43 02.95 +24 40 10.9 11.40 11.26 -0.14 V810 Tau 844 BY 12.040 12.115 V
03 43 02.95 +24 41 32.4 15.70 15.62 -0.08 LU Tau 853 Fl 14.500 17.970 B
03 43 11.90 +24 44 40.9 16.17 - - V509 Tau 854 Fl 16.400 18.800 B
03 43 13.06 +24 39 20.1 14.89 15.09 0.20 LV Tau 855 Fl 13.800 17.900 B
Calibration of the original image was made using the
NOMAD catalogue [8]. Although NOMAD is not a
photometric catalogue, its V magnitudes are of high
accuracy [6].
Fig. 2: Dependence of the instrumental magnitudes on
those given in the NOMAD catalogue.
Fig. 3: Example of the original image with stars from
GTSh10 catalogue.
Dependence of the mean square error on the in-
strumental magnitude is shown in Fig. 4. It was built
using six measurements of the same area as in Fig. 2.
An example of the data in the �nal catalogue is
given in Table 2 (M45_1 area). It contains coordi-
nates of the stars, instrumental magnitudes (m1obs),
192
Advances in Astronomy and Space Physics A.A. Savushkin, A.A. Shlyapnikov
V-magnitudes (m2cat) from catalogue NOMAD, dif-
ferences of magnitudes (m2-m1), names of stars, the
object number in the GTSh10 catalogue (GTSh10),
type of the star from SIMBAD [3], magnitudes at max-
imum and minimum from VSX [7] catalogue (VSXmax
and VSXmin), passband of observations from VSX
catalogue (P).
Fig. 4: Dependence of the mean square error on instru-
mental magnitude.
results and conclusions
The result of the present work is a �nal catalogue
of about 1000 stars in 10 areas around M45, 77 of
which are from the GTSh10 catalogue. No �ares
or any other activity were registered in studied ob-
jects because of the short period of observations. All
observational data are presented on the CrAO web-
page3. To view the distribution of areas and CCD
images via Aladin interface, click `MTO-1000 Patrol
Observations M45'.
acknowledgement
Authors are grateful to researchers of the Stras-
bourg astrophysical data centre (France) for sup-
port of interactive applications SIMBAD, VizieR, and
Aladin. We highly appreciate V. I. Burnashev for
important comments on the �rst version of this pa-
per.
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[3] GenovaF., AllenM.G., BienaymeO. et al. 2005, BAAS,
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[4] GershbergR.E., TerebizhA.V. & ShlyapnikovA.A. 2011,
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[5] JohnsonH. L. & Mitchell R. I. 1958, ApJ, 128, 31
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3http://crao.crimea.ua/∼aas/PROJECTs/PROJECTs.html
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