StromgrenIndices

java.lang.Object
- astro.StromgrenIndices

public class StromgrenIndices
extends Object

This small class allows calculation of expected RMS in T_eff, Fe/H, and log(g) determination from Stromgren indices (no H_beta necessary). It is based on the following papers:

A&A 475, 519 (2007) Holmberg; H07
A&AS 57, 443 (1984) Olsen; O84
ApJ 626, 446 (2005) Ramirez; R05
A&A 521, A40 (2010) Arnadottir; A10

From O84, we use mainly table VI:

   #b-y m1      c1      M_V (ZAMS)
   370  201     318     4.45
   384  208     302     4.61
   394  214     290     4.74
   412  230     270     4.98
   430  254     254     5.27
   450  285     241     5.57
   455  293     240     5.63
   460  302     241     5.69
   470  320     243     5.80
   480  340     246     5.90
   490  362     250     5.99
   500  384     252     6.08
   510  408     252     6.17
   520  432     251     6.25
   530  458     249     6.34
   540  483     246     6.42
   550  508     242     6.50
   560  532     237     6.58
   570  555     230     6.66
   580  578     221     6.74
   590  600     211     6.82
   600  621     199     6.90
   610  641     188     6.97
   620  661     176     7.04
   630  681     165     7.11
   640  698     155     7.18
   650  713     146     7.25
   660  725     138     7.32
   670  736     130     7.38
   680  744     123     7.45
   690  750     115     7.52
   700  754     108     7.59
   710  757     100     7.66
   720  759     093     7.73
   730  761     085     7.80
   740  761     077     7.87
   750  758     069     7.94
   760  754     060     8.01
   770  748     051     8.08
   780  737     042     8.15
   785  731     039     8.18
   790  723     040     8.22
   800  708     046     8.27
   900  554     097     8.87
   930  508     112     9.05
   986  422     141     9.95

which should be available under /z/wooz/catalogues/geneva_copenhagen2009 as file olsen84.tab6. In the same directory, there is a template grace file for plotting various relationships as a function of M_V.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`StromgrenIndices.FeH` We use the provided uncertainties in Fe/H and b-y to calculate uncertainties in T_eff from the Olsen list.
`static class`	`StromgrenIndices.LogG` We use the provided uncertainties in Fe/H and b-y to calculate uncertainties in T_eff from the Olsen list.
`static class`	`StromgrenIndices.Teff` We use the provided uncertainties in Fe/H and b-y to calculate uncertainties in T_eff from the Olsen list.

Field Summary

Fields
Modifier and Type	Field and Description
`private static String`	`DIR` Catalog directory.
`private List<VectorG>`	`dwarfs` The parsed version of Tab6, Vector indices as in the file.
`private static String`	`O84` The table 6 file from O84, copy from comment if missing.

Constructor Summary

Constructors
Constructor and Description
`StromgrenIndices()` On init, we read the olsen table and convert it to a vector, dividing the first three columns by 1000.
`StromgrenIndices(File o84)` On init, we read the olsen table and convert it to a vector, dividing the first three columns by 1000.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static double`	`getA10logg(double by, double c1, double m1)` Returns log(g) from A10.
`static double`	`getA10loggVar(double by, double byvar, double c1, double c1var, double m1, double m1var)` Returns the variance of log(g) from A10.
`static double`	`getH07FeH(double by, double c1, double m1)` Returns the value of Fe/H from the H07, section 4.2 as a function of (b-y), m1 and c1.
`static double`	`getH07Theta(double by, double fe)` We return θ_ff from H07, equs.
`static double`	`getH07ThetaVar(double by, double byvar, double fe, double fevar)` Returns the variance on theta, given b-y, its variance, Fe/H and its variance using the relation for θ_ff from H07, equs.
`static double`	`getR05FeH(double by, double c1, double m1)` Returns the value of Fe/H from R05.
`static double`	`getR05FeHVar(double by, double byvar, double c1, double c1var, double m1, double m1var)` Returns the variance on Fe/H from R05.
`static double`	`getTeff(double theta)` Converts theta to T_eff.
`static double`	`getTeffErr(double theta, double dth)` Converts an error in theta to an error in Teff, using theta and d(theta)

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - DIR
```
private static final String DIR
```
    Catalog directory.
    
    See Also:
    
    Constant Field Values
  - O84
```
private static final String O84
```
    The table 6 file from O84, copy from comment if missing.
    
    See Also:
    
    Constant Field Values
  - dwarfs
```
private List<VectorG> dwarfs
```
    The parsed version of Tab6, Vector indices as in the file.
- Constructor Detail
  - StromgrenIndices
```
public StromgrenIndices()
```
    On init, we read the olsen table and convert it to a vector, dividing the first three columns by 1000.
  - StromgrenIndices
```
public StromgrenIndices(File o84)
```
    On init, we read the olsen table and convert it to a vector, dividing the first three columns by 1000.
- Method Detail
  - getTeff
```
public static double getTeff(double theta)
```
    Converts theta to T_eff.
```
       θ_ff = 5040K/T_eff
       
```
  - getTeffErr
```
public static double getTeffErr(double theta,
                                double dth)
```
    Converts an error in theta to an error in Teff, using theta and d(theta)
  - getH07Theta
```
public static double getH07Theta(double by,
                                 double fe)
```
    We return θ_ff from H07, equs. in sec. 3.3 for a given (b-y) and metallicity [Fe/H]. Note the definition of
```
       θ_ff = 5040K/T_eff
       
```
    Three different b-y ranges are considered, the realtion is valid for 0.2
  getH07ThetaVar public static double getH07ThetaVar(double by, double byvar, double fe, double fevar) Returns the variance on theta, given b-y, its variance, Fe/H and its variance using the relation for θ_ff from H07, equs. in sec. 3.3. Note that this variance ignores the fact that b-y and Fe/H might have a non-vanishing correlation, which would stem from the linear regression used to derive H07 equs. in the first place. The variance of b-y is the square of the standard deviation in b-y. The standard deviation, in turn, is mostly used equally to the error in b-y. Parameters: byvar - Variance of b-y, square of error in b-y. fevar - Variance of [Fe/H], square of error in [Fe/H]. getH07FeH public static double getH07FeH(double by, double c1, double m1) Returns the value of Fe/H from the H07, section 4.2 as a function of (b-y), m1 and c1. The relation is valid for 0.24 getR05FeH public static double getR05FeH(double by, double c1, double m1) Returns the value of Fe/H from R05. getR05FeHVar public static double getR05FeHVar(double by, double byvar, double c1, double c1var, double m1, double m1var) Returns the variance on Fe/H from R05. getA10logg public static double getA10logg(double by, double c1, double m1) Returns log(g) from A10. getA10loggVar public static double getA10loggVar(double by, double byvar, double c1, double c1var, double m1, double m1var) Returns the variance of log(g) from A10.

Class StromgrenIndices

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DIR

O84

dwarfs

Constructor Detail

StromgrenIndices

StromgrenIndices

Method Detail

getTeff

getTeffErr

getH07Theta

getH07ThetaVar

getH07FeH

getR05FeH

getR05FeHVar

getA10logg

getA10loggVar