The SWEET-Cat catalog

class PyAstronomy.pyasl.SWEETCat(skipUpdate=False)

Access the SWEET-Cat catalog.

The SWEET-Cat catalog provides parameters for planet host stars.

The following data are provided

Column	Description	Unit
star	Name of the star
hd	The HD number (if available)
ra	The right ascension	hms
dec	The declination	dms
vmag	V magnitude	mag
ervmag	Error on V magnitude	mag
par	Parallax	mas
erpar	Error on parallax	mas
parsource	If par is from Simbad or calculated
teff	Effective temperature	K
erteff	Error on effective temperature	K
logg	Surface gravity	cgs
erlogg	Error on surface gravity	cgs
logglc	Surface gravity from LC	cgs
erlogglc	Error on surface gravity from LC	cgs
vt	Micro turbulence	km/s
ervt	Error on micro turbulence	km/s
metal	Metallicity ([Fe/H])
ermetal	Error on metallicity
mass	Mass calculated from Torres et al.	Solar
ermass	Error on calculated mass	Solar
author	Author of source
link	Link to paper in ADS
source	1 means CAUP’s method. 0 otherwise
update	When the parameters were updated
comment1	Special comment
comment2	Blank

Detailed information can be found here: https://www.astro.up.pt/resources/sweet-cat/ and in the associated publications.

Attributes

datapandas data frame

The catalog data

Methods

changeDownloadCycle(c)	Change the time after which the data are updated.
dataAge()	Determine the "age" of the data.
downloadData()	Trigger download of data.
needsUpdate()	Determine whether data need to be updated.

downloadData()

Trigger download of data.

Example: Access catalog via pandas data frame

from __future__ import print_function
from PyAstronomy import pyasl

sc = pyasl.SWEETCat()

# Access via pandas data frame
# Show first three rows
print(sc.data[0:3])
print()

# Which stars are available?
print("Available stars: ", sc.data["star"].values)
print()

# Check whether star is "available"
star = "XO-5"
starInTable = (star in sc.data.star.values)
print("Is " + star + " in the table? ", starInTable)

if starInTable:
  # Get information on that star
  print("Data for star: ", star)
  info = sc.data[sc.data["star"] == star]
  print(info)
  print()
  print("Get the effective temperature")
  teff, erteff = info["teff"], info["erteff"]
  print("Effective temperature of " + star + " = %6.1f +/- %6.1f K" % (teff, erteff))