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J/A+AS/111/399      Polarization variability in Herbig Ae/Be stars (Jain+, 1995)
Study of variability of the polarization in Herbig Ae/Be stars
       JAIN S.K., BHATT H.C.
      <Astron. Astrophys. Suppl. Ser. 111, 399 (1995)>
      =1995A&AS..111..399J      (SIMBAD/NED Reference)
ADC_Keywords: Stars, early-type; Polarization

Keywords: stars: emission-line, Ae - polarization - stars: variable -
          stars: pre-main sequence

Description:
   We report our measurements of linear polarization of a number of Herbig Ae/Be
   stars made at several epochs during the period 1989-1993. These results
   together with the observations compiled from the published sources have been
   analysed to study the variability of polarization in Herbig Ae/Be stars.
   It is found that polarimetric variability is a common feature of this class
   of objects. Most of the objects are variable on time scales ≥1yr.
   Some objects have shown large variations on time scales as short as ∼1 month
   indicating structural changes in the distribution of circumstellar matter
   close to the star within a few tens of stellar radii. Variations in the
   polarization position angle are not always correlated with variations in the
   degree of polarization.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1           114       91   Polarimetric data for Herbig Ae/Be stars
table1.tex        81      415   TeX version of table1


Byte-by-byte Description of file: table1

   Bytes Format  Units   Label    Explanations

   1-  2  I2     ---     SN       Sequential number
   3- 16  A14    ----    Name     Object name
  17- 26  A10    ---     Date     observation date
  28- 31  F4.2   %       pU       []? Degree of polarization in U filter
  33- 36  F4.2   %       e_pU     []? rms uncertainty on pU
  38- 40  I3     deg     paU      []? Position angle in U filter
  42- 43  I2     deg     e_paU    []? rms uncertainty on paU
  45- 48  F4.2   %       pB       []? Degree of polarization in B filter
  50- 53  F4.2   %       e_pB     []? rms uncertainty on pB
  55- 57  I3     deg     paB      []? Position angle in B filter
  59- 60  I2     deg     e_paB    []? rms uncertainty on paB
  62- 65  F4.2   %       pV       []? Degree of polarization in V filter
  67- 70  F4.2   %       e_pV     []? rms uncertainty on pV
  72- 74  I3     deg     paV      []? Position angle in V filter
  76- 77  I2     deg     e_paV    []? rms uncertainty on paV
  79- 82  F4.2   %       pR       []? Degree of polarization in R filter
  84- 87  F4.2   %       e_pR     []? rms uncertainty on pR
  89- 91  I3     deg     paR      []? Position angle in R filter
  93- 94  I2     deg     e_paR    []? rms uncertainty on paR
  96- 99  F4.2   %       pI       []? Degree of polarization in I filter
 101-104  F4.2   %       e_pI     []? rms uncertainty on pI
 106-108  I3     deg     paI      []? Position angle in I filter
 110-111  I2     deg     e_paI    []? rms uncertainty on paI
 113-114  I2     ---     ref      References (1)

Note (1): References:
                     1 Present work
                     2 Garrison M. Jr, Anderson C.M. 1978, 221, 601
                        Bull. Astron.Soc.India,  21, 541
                     3 Jain S.K., Bhatt H.C., Ram Sagar, 1990, A&AS, 83, 237
                     4 Vbra F.J. 1975, ApJ, 195, 101
                     5 Vrba F.J. Schmidt G.D., Hintzen P.M. 1979, ApJ, 227, 185

(End)                                           Patricia Bauer [CDS] 21-Nov-1994