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J/A+A/459/871     Chemically peculiar stars in the LMC          (Paunzen+, 2006)

Chemically peculiar stars in the Large Magellanic Cloud Paunzen E., Maitzen H.M., Pintado O.I., Claret A., Iliev I.K., Netopil M. <Astron. Astrophys. 459, 871 (2006)> =2006A&A...459..871P
ADC_Keywords: Magellanic Clouds ; Stars, peculiar ; Stars, early-type ; Photometry, UBVRI ; Photometry, narrow-band Keywords: galaxies: Magellanic Clouds - stars: chemically peculiar - stars: early-type - techniques: photometric Abstract: We present high precision photometric Delta a observations of 417 objects in NGC 2136/7 and its surrounding field, of which five turned out to be bona fide magnetic CP stars. In addition, we discovered two Be/Ae stars. This intermediate band photometric system samples the depth of the 520nm flux depression by comparing the flux at the center with the adjacent regions with bandwidths of 11nm to 23nm. The Delta a photometric system is most suitable for detecting CP2 stars with high efficiency, but is also capable of detecting a small percentage of non-magnetic CP objects. From our investigations of NGC 1711, NGC 1866, NGC 2136/7, their surroundings, and one independent field of the LMC population, we derive an occurrence of classical chemically peculiar stars of 2.2(6)% in the LMC, which is only half the value found in the Milky Way. The mass and age distribution of the photometrically detected CP stars is not different from that of similar objects in galactic open clusters. Description: Photometric CCD Delta a measurements of objects within the LMC cluster NGC 2136/7 and its surrounding were obtained at CASLEO and ESO-La Silla. Object: ---------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------- 05 53 17 -69 31.7 NGC 2136/7 = NGC 2136 ---------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 132 417 Observed program stars in NGC 2136/7 and its surrounding
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [1,417] Stars number sorted after X and Y 5- 13 F9.6 h RAhr Right Ascension (J2000.0) 15- 23 F9.5 deg DEdeg Declination (J2000.0) 25- 30 F6.1 pix Xpos X coordinate 32- 34 F3.1 pix e_Xpos rms uncertainty on X coordinate 36- 41 F6.1 pix Ypos Y coordinate 43- 45 F3.1 pix e_Ypos rms uncertainty on Y coordinate 47- 52 F6.3 mag g1-y Mean (g1-y) index 54- 58 F5.3 mag e_g1-y rms uncertainty on (g1-y) 60- 65 F6.3 mag Da ? Deviation from cluster line (Delta a) 67- 71 F5.3 mag a ? Mean a index (a=g2-[(g1+y)/2]) 73- 77 F5.3 mag e_a ? rms uncertainty on a 79- 84 F6.3 mag Umag ? Johnson U magnitude (1) 86- 90 F5.3 mag e_Umag ? rms uncertainty on U magnitude 92- 97 F6.3 mag Bmag ? Johnson B magnitude (1) 99-103 F5.3 mag e_Bmag ? rms uncertainty on B magnitude 105-110 F6.3 mag Vmag ? Johnson V magnitude (1) 112-116 F5.3 mag e_Vmag ? rms uncertainty on V magnitude 118-123 F6.3 mag Imag ? Johnson I magnitude (1) 125-129 F5.3 mag e_Imag ? rms uncertainty on I magnitude 131-132 I2 --- N [10,69] Number of measurements
Note (1): Magnitudes from Zaritsky et al., 2004AJ....128.1606Z.
Acknowledgements: Ernst Paunzen, ernst.paunzen(at)univie.ac.at
(End) Ernst Paunzen [Vienna, Austria], Patricia Vannier [CDS] 05-Mar-2007
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