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J/AZh/77/420 Photopolarimetric activity of SV Cep (Rostopchina+, 2000)
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Photopolarimetric activity of the Ae Herbig star SV Cep.
Rostopchina, A.N., Grinin, V.P., Shakhovskoy, D.N., The P.S.,
Minikulov N.Kh.
<Astron. Zh. 77, 420 (2000)>
=2000ARep...44..365R
=2000AZh....77..420R
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ADC_Keywords: Stars, pre-main sequence; Stars, variable; Photometry, UBVRI;
Polarization
Abstract:
The results of the eleven-years (1987-98) photopolarimetric patrol
observations of Herbig Ae star SV Cep are presented. Only one deep
brightness minimum of star were observed during this time interval.
The decrease of the SV Cep brightness during this minimum was
accompanied by increase of its linear polarization. The similar
behaviour of linear polarization with the brightness changes was found
earlier in other young stars with the non-periodic Algol-type minima.
The most probable interpretation of this phenomenon is based on the
model in which the source of intrinsic linear polarization is the
scattered radiation of circumstellar disk-like dust envelope (probably
the proto-planetary disk). The deposition of this source increases
during the brightness minima when the direct (non-polarized) stellar
radiation are absorbed in the CS dust clouds intersected the
line-of-sight.
Object:
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RA (2000) DE Designation
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22 21 33.6 +73 40 26 SV Cep = HD+72 1031 = HBC 736=JP11 238
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 138 466 SV Cep photometric and polarimetric
UBVRI observations at CrAO.
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See also:
J/AZh/78/60 : Photometry and polarimetry of Ae star VV Ser (Rostopchina+ 2001)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d JDH [2446929/2451120] Julian date
13- 18 F6.3 mag Vmag V magnitude
20- 24 F5.3 mag U-B ? U-B color
26- 30 F5.3 mag B-V B-V color
32- 36 F5.3 mag V-R ? V-R color
38- 42 F5.3 mag V-I ? V-I color
44- 47 F4.2 % P(U) ? Degree of linear polarization in U band
49- 52 F4.2 % e_P(U) ? Mean error on P(U)
54- 58 F5.1 deg PA(U) ? Position angle of polarization in U band
60- 62 F3.1 deg e_PA(U) ? Mean error on PA(U)
64- 67 F4.2 % P(B) ? Degree of linear polarization in B band
69- 72 F4.2 % e_P(B) ? Mean error on P(B)
74- 77 F4.1 deg PA(B) ? Position angle of polarization in B band
79- 81 F3.1 deg e_PA(B) ? Mean error on PA(B)
83- 86 F4.2 % P(V) ? Degree of linear polarization in V band
88- 91 F4.2 % e_P(V) ? Mean error on P(V)
93- 96 F4.1 deg PA(V) ? Position angle of polarization in V band
98-100 F3.1 deg e_PA(V) ? Mean error on PA(V)
102-105 F4.2 % P(R) ? Degree of linear polarization in R band
107-110 F4.2 % e_P(R) ? Mean error on P(R)
112-115 F4.1 deg PA(R) ? Position angle of polarization in R band
117-119 F3.1 deg e_PA(R) ? Mean error on PA(R)
121-124 F4.2 % P(I) ? Degree of linear polarization in I band
126-129 F4.2 % e_P(I) ? Mean error on P(I)
131-134 F4.1 deg PA(I) ? Position angle of polarization in I band
136-138 F3.1 deg e_PA(I) ? Mean error on PA(I)
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Table3: Polarimetry data of SV Cep neighbor stars
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field star RA DE P(V) e_P(V) PA(V) e_PA(V)
deg deg % % deg deg
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a 22.3158 +73.7622 0.58 0.15 58.9 4.2
b 22.3583 +73.8589 0.64 0.08 35.5 3.5
f 22.3883 +73.9689 0.73 0.13 49.9 6.5
g 22.4089 +73.9170 0.61 0.14 61.1 6.9
j 22.4386 +73.8156 0.32 0.10 52.3 7.0
k 22.3183 +73.3867 1.02 0.12 34.3 3.6
l 22.3478 +73.4678 0.79 0.13 45.0 4.8
s 22.4069 +73.3633 2.50 0.23 44.1 2.8
t 22.4292 +73.5089 1.38 0.22 74.2 4.1
gamma 22.3608 +73.6511 1.01 0.12 50.5 3.5
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(End) Alla Rostopchina [CrAO], Veta Avedisova [INASAN] 22-March-2001