SUMER spectra

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SUMER spectra
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Continuum measurements

• 1st- order 1350 Å, 2nd-order 675 Å
• 1st- and 2nd-order continuum near Fe XII
• 2nd-order continuum near C II
• 2nd- order more apt to be absorbed by H I
• Ratio of 1st-to-2nd-order cont. shows location of
  absorption

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Time-space stackplots
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Time-space stackplots
Dark in emission lines ? not hot dense
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Continuum ratio maps
(3.5 x 1st-order ? 2nd-order) (bremsstrahlung ?
ratio1)
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Binaries

• Visual binary (VB) see both stars
• Astrometric binary (AB) see one, but it
  wiggles
• Spectroscopic binary (SB) see one, but
  line-of-sight velocity oscillates
• Eclipsing binary (EB) light curve

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SB

• Splitting or shifting of spectral lines
• single line, one star much brighter than the
  other, compare shift to local calibration lamp
• double line, see spectrum from both stars

Radial velocity v ?? c / ?0
double line ? ratio of v1/v2 yields M2/M1 If
(Rr)/a ? cos(inclination), then ? EB
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• Fake simple eclipse
• Deeper primary eclipse is when the hotter star
  is hidden
• A flat bottom to the eclipse indicates that the
  star is completely obscured
• Time in eclipse, as fraction of the total period,
  yields info about relative sizes, separation,
  even tidal bulge

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Example oblate spheroid with a tidal bulge
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Example brightening around secondary minimum?
Answer brighter star reflects off the fainter
star
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P period a semimajor axis of relative orbit
(arcsec) a semimajor axis of absolute orbit
(a.u., or pc) ? parallax (arcsec)