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J/A+A/547/A96 Low-mass He-core white dwarfs seismic properties (Corsico+, 2012)
The seismic properties of low-mass He-core white dwarf stars.
    Corsico A.H., Romero A.D., Althaus L.G., Hermes J.J.
   <Astron. Astrophys. 547, A96 (2012)>
   =2012A&A...547A..96C
ADC_Keywords: Models ; Stars, white dwarf ; Abundances

Keywords: asteroseismology - stars:oscillations - white dwarfs -
          stars: evolution - stars: interiors

Description:
    We present detailed tabulations of stellar models and pulsational
    properties for low-mass He-core white dwarf stars, for different
    stellar masses and effective temperatures. Pulsation periods were
    computed for g- and p-modes with harmonic degree l=1. The stellar mass
    ranges from 0.17M_☉ to 0.45M_☉, while the effective
    temperature ranges from 13000 to 8000K. The pulsation periods are
    listed in files named avam.mmmg.tgz and avam.mmmp.tgz, for g- and
    p-modes, respectively, were m.mmm denotes the stellar mass in solar
    mass units. These files contain a sequence of tables
    (avannnm.mmmg.out and avannnm.mmmp.out) corresponding to models
    with decreasing effective temperature, where nnn correspond to the
    number of file, starting with nnn=001. In each avannnm.mmmg.out and
    avannnm.mmmp.out files, the following quantities are listed:
    harmonic degree (l), radial order (k), Period, period spacing (DP),
    kinetic energy (log(Ek)) and first order rotation splitting
    coefficient (C_kl). The stellar parameters characterizing each model
    are listed at the top of the table as a header: stellar mass in solar
    units (M*/M☉), luminosity in solar units (L*/L☉),
    effective temperature in Kelvin (Teff[K]), hydrogen mass in units of
    the stellar mass (log(MH/M*)), age in millions of years (Time
    [106yr]), and asymptotic period spacing in seconds (DPa [s], for
    g-modes only). The chemical profiles and critical frequencies are
    listed in the files par_m.mmm.tgz, which contain a sequence of tables
    corresponding to models with decreasing effective temperature
    (parnnn_m.mmm.out). Stellar parameters of each model are listed as a
    header: stellar mass in solar units (M*/M☉), effective
    temperature in Kelvin (Teff[K]), luminosity in solar units
    (L*/L☉) and hydrogen mass in units of stellar mass
    (log(MH/M*)). Below the header, the following quantities are listed:
    normalized radial coordinate (r/R_*), the outer mass fraction
    coordinate (-log q, with q=1-Mr/M*), the squared Brunt-Vaisala
    (N2) and Lamb (L2) frequencies, the Ledoux term (B Ledoux), and
    the abundances by mass of hydrogen (H1), helium (He4), carbon (C12)
    and oxygen (O16).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
ava_g.dat        127    44871  *Pulsation periods for g-modes with harmonic degree l=1
ava_p.dat        127    30338  *Pulsation periods for p-modes with harmonic degree l=1
par.dat          143   166873   Chemical profiles and critical frequencies
files/*            0       24   Original files (avam.mmm?.tgz and par_m.mmm.tgz)

Note on ava_g.dat: list g-modes with periods shorter than 6000s.

Note on ava_p.dat: list p-modes with with radial order K<50.



See also:
 J/MNRAS/399/699 : Parameters of atmospheres of white dwarfs (Mortlock+, 2009)
 J/A+A/465/249   : Age and colors of massive white dwarf stars (Althaus+, 2007)


Byte-by-byte Description of file: ava_[gp].dat

   Bytes Format Units   Label     Explanations

   1-  3  I3    ---     Mod       [1/95] Model number (1)
   5- 11  F7.5  Msun    M*        [0.16985/0.45219] Model stellar mass (G1)
  13- 26  E14.9 Lsun    L*        [0.0007347/0.12594] Model stellar luminosity
  28- 37  F10.4 K       Teff      [7006.28/14223.5] Model effective temperature
  39- 44  F6.3  [-]     logMH/M*  [-3.44/-1.87] Model hydrogen mass in
                                    stellar mass units
  46- 54  F9.3  Myr     Age       [11495.5/16446.7] Model age
  56- 65  F10.6 s       DPa       ? Model asymptotic period spacing
                                    (for g-mode only)
      67  I1    ---     l         [1] Harmonic degree
  69- 71  I3    ---     k         [1/100] Radial order
  73- 85  F13.8 s       Per       [0.501/5999.96] Pulsation period
  87-102  E16.8 s       DP        [-37.740/159.925] Period spacing
 104-112  F9.6  [10-7J] log(Ek)   [38.8704/48.9739] Kinetic energy
 114-127  E14.8 ---     Ckl       [-0.01261/0.88858] First order rotation
                                    splitting coefficient

Note (1): In general, there exists no correspondence between the pairs of
     files ava0010.170g.out and ava0010.170p.out (for instance), here
     same Num and M* in ava_g.dat and ava_p.dat, in the sense that, in
     spite of the fact that both files share the same numbering (nnn=001),
     they correspond to stellar models with different effective
     temperatures. This holds in general for all the files
     avannnm.mmmg.out and avannnm.mmmp.out with the same nnn and
     stellar mass (m.mmm).


Byte-by-byte Description of file: par.dat

   Bytes Format Units   Label     Explanations

   1-  3  I3    ---     Mod       [1/18] Model number
   5- 11  F7.5  Msun    M*        [0.16985/0.45219] Model stellar mass (G1)
  13- 22  F10.4 K       Teff      [7015.53/13983.6] Model effective temperature
  24- 37  E14.8 Lsun    L*        [0.0007347/0.12594] Model stellar luminosity
  39- 44  F6.3  [-]     logMH/M*  [-3.431/-1.886] Model hydrogen mass in
                                    stellar mass units
  46- 55  E10.5 ---     r/R*      [0/1] Normalized radial coordinate
  57- 66  E10.5 [-]     mlogq     [0/15.85] Outer mass fraction coordinate,
                                   -logq (with q=1-Mr/M*)
  68- 77  E10.5 ---     N+2       [0/37.16] Squared Brunt-Vaisala frequency
  79- 88  E10.5 ---     L+2       [0/104.7] Squared Lamb frequency
  90- 99  E10.5 ---     BLedoux   [0/1.58] Ledoux term
 101-110  E10.5 ---     H1        [-1.81e-38/0.9967] Hydrogen abundance by mass
 112-121  E10.5 ---     He4       [0/0.9905] Helium abundance by mass
 123-132  E10.5 ---     C12       [0/0.0007] Carbon abundance by mass
 134-143  E10.5 ---     O16       [0/0.0088] Oxygen abundance by mass


Globle notes:

Note (G1): Model stellar mass studies:
   0.16985, 0.19802, 0.22047, 0.25053, 0.30316, 0.35807, 0.40002 and 0.45219


Acknowledgements:
    Alejandro Corsico, acorsico(at)fcaglp.unlp.edu.ar
    Alejandra Romero, aromero(at)fcaglp.unlp.edu.ar
(End)                                        Patricia Vannier CDS    11-Oct-2012