adj instead of adv?

[Nessie]

Hi, please have a look at this:

He had not been to Gilly very often during the nine months since he arrived on Drogheda, but his position as Mary Carson's brother and heir apparent meant that he had been treated very hospitably whenever he had been in town, and that his face was well-remembered

=> why "apparent" and not "apparently"?

Thank you so much.
Nessie.
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:(... something we never have again, I know... I guess I really really know.. :(

Sorry seems to be the hardest word...

[Yankee]

Hi Nessie

The word 'apparent' refers to the noun 'heir'.

Look at this:
http://www.bartleby.com/61/75/H0127500.html
.
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"Nearly all men can stand adversity, but if you want to test a man's character, give him power." ~ Abraham Lincoln